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Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of... | 1B | |
Lecture: People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to... | 1B | |
Lecture: An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which ... | 1B | |
Lecture: Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a sou... | 1B | |
Question: What is the capital of New Hampshire?
Choices:
A. Augusta
B. New York City
C. Manchester
D. Concord
Answer with the letter. | 3D | |
Lecture: A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers.
Question: Which i in row C?
C... | 3D | |
Lecture: Moss plants reproduce using both asexual reproduction and sexual reproduction.
Moss plants use their male and female parts for sexual reproduction. The male parts produce sperm. Moss live in damp environments, and moss sperm can travel through water to the female parts.
The sperm fuse with eggs in the female p... | 1B | |
Question: What is the capital of Hawaii?
Choices:
A. Helena
B. Santa Fe
C. Honolulu
D. Phoenix
Answer with the letter. | 2C | |
Lecture: People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to... | 1B | |
Question: What is the name of the colony shown?
Choices:
A. Maryland
B. New Jersey
C. Rhode Island
D. Delaware
Answer with the letter. | 1B | |
Lecture: A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
Question: Is the following statement about our solar system true or false?
The largest planet is made mainly of ice.
H... | 1B | |
Lecture: The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater th... | 2C | |
Lecture: Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar ... | 0A | |
Lecture: Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar ... | 2C | |
Question: What can Percy and Cole trade to each get what they want?
Hint: Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Percy and Cole open their lunch boxes in the school caf... | 0A | |
Question: Which country is highlighted?
Choices:
A. Solomon Islands
B. Tonga
C. Tuvalu
D. Fiji
Answer with the letter. | 3D | |
Lecture: Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most ma... | 1B | |
Lecture: There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you.
A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances ... | 1B | |
Lecture: Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification.
Question: Select the amphibian below.
Hint: Amphibians have moist skin and begin... | 0A | |
Lecture: Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean.
Question: Which ocean is highlighted?
Choices:
A. the Arctic Ocean
B. the Southern Ocean
C. the Pacific Ocean
D. the Atlantic Ocean
Answer with the letter. | 2C | |
Lecture: To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show specific humidity, a measurement of the amount of water vapor in the air.
The map's legend tells you the specific humidity level that each color represents. Colors on the l... | 0A | |
Lecture: Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a sou... | 0A | |
Lecture: An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat... | 1B | |
Lecture: A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
The volume of a planet is a very large quantity. Large quantities such as this are often written in scientific notatio... | 0A | |
Lecture: An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in... | 0A | |
Lecture: A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers.
Question: Which i in row A?
C... | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 2C | |
Lecture: Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar ... | 1B | |
Question: What is the name of the colony shown?
Choices:
A. South Carolina
B. North Carolina
C. Virginia
D. Florida
Answer with the letter. | 0A | |
Question: What is the capital of Maryland?
Choices:
A. Boston
B. Omaha
C. Dover
D. Annapolis
Answer with the letter. | 3D | |
Question: What can Kayla and Janet trade to each get what they want?
Hint: Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Kayla and Janet open their lunch boxes in the school c... | 1B | |
Lecture: Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most ma... | 3D | |
Lecture: An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Groupin... | 0A | |
Lecture: A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
The volume of a planet is a very large quantity. Large quantities such as this are often written in scientific notatio... | 1B | |
Question: Which state is highlighted?
Choices:
A. Colorado
B. Washington
C. Nevada
D. Idaho
Answer with the letter. | 2C | |
Lecture: People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to... | 0A | |
Lecture: Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most ma... | 2C | |
Lecture: To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show air temperatures.
The map's legend tells you the temperature that each color represents. Colors on the left in the legend represent lower temperatures than colors on the ri... | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 2C | |
Question: What can Abdul and Elise trade to each get what they want?
Hint: Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Abdul and Elise open their lunch boxes in the school c... | 3D | |
Question: What is the capital of Rhode Island?
Choices:
A. Newport
B. Augusta
C. Providence
D. Carson City
Answer with the letter. | 2C | |
Lecture: Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at... | 1B | |
Lecture: Offspring phenotypes: dominant or recessive?
How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the t... | 0A | |
Lecture: A continent is one of the major land masses on the earth. Most people say there are seven continents.
Question: Which continent is highlighted?
Choices:
A. Antarctica
B. North America
C. South America
D. Europe
Answer with the letter. | 2C | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south.
Here are some examples of magnet... | 0A | |
Question: Which of these cities is marked on the map?
Choices:
A. Salt Lake City
B. San Jose
C. Los Angeles
D. Portland
Answer with the letter. | 3D | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of... | 0A | |
Lecture: A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater... | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 2C | |
Lecture: A continent is one of the major land masses on the earth. Most people say there are seven continents.
Question: Which continent is highlighted?
Choices:
A. Europe
B. Asia
C. Africa
D. North America
Answer with the letter. | 1B | |
Lecture: The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater th... | 0A | |
Lecture: A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another.
When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doin... | 0A | |
Question: What can Gavin and Nolan trade to each get what they want?
Hint: Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Gavin and Nolan open their lunch boxes in the school c... | 2C | |
Lecture: An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help ... | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 2C | |
Lecture: A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each foo... | 3D | |
Lecture: A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers.
Question: Which i in column 1... | 3D | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each oth... | 2C | |
Lecture: An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with th... | 1B | |
Lecture: In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of dif... | 0A | |
Lecture: In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of dif... | 1B | |
Lecture: Every organism needs food to stay alive. Organisms get their food in different ways. A food chain shows how organisms in an ecosystem get their food.
Producers make their own food. Many producers use carbon dioxide, water, and sunlight to make sugar. This sugar is food for the producer.
Consumers eat other org... | 1B | |
Question: What is the capital of Georgia?
Choices:
A. Atlanta
B. Topeka
C. Athens
D. Savannah
Answer with the letter. | 0A | |
Lecture: An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which ... | 1B | |
Question: What is the capital of Mississippi?
Choices:
A. Jackson
B. Raleigh
C. Biloxi
D. Tallahassee
Answer with the letter. | 0A | |
Lecture: Offspring genotypes: homozygous or heterozygous?
How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene.
An organism with two identical alleles for a gene is homozygous for that gene.
If both alleles are dominant, the orga... | 1B | |
Lecture: The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater th... | 1B | |
Question: What is the capital of Maryland?
Choices:
A. Harrisburg
B. Augusta
C. Norfolk
D. Annapolis
Answer with the letter. | 3D | |
Question: What is the capital of California?
Choices:
A. Sacramento
B. Salem
C. Dover
D. Santa Fe
Answer with the letter. | 0A | |
Lecture: Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar ... | 2C | |
Lecture: A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater... | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 1B | |
Lecture: Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most ma... | 0A | |
Lecture: A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater... | 2C | |
Lecture: Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together.
Scientists use both ball-and-stick models and chemical ... | 0A | |
Lecture: The way an organism looks or acts is called a trait. Scientists use fossils to learn more about the traits of ancient organisms.
Fossils can preserve the remains of body parts and activities. A fossil of a body part, such as a tail or a wing, can tell you what an organism looked like. A fossil of an organism's... | 0A | |
Lecture: Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification.
Question: Select the bird below.
Hint: Birds have feathers, two wings, and a bea... | 0A | |
Lecture: The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pa... | 1B | |
Lecture: A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater... | 1B | |
Lecture: A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each foo... | 1B | |
Lecture: A planet's volume tells you the size of the planet.
The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.
The volume of a planet is a very large quantity. Large quantities such as this are often written in scientific notatio... | 1B | |
Question: What is the capital of Massachusetts?
Choices:
A. Plymouth
B. Montgomery
C. Boston
D. Hartford
Answer with the letter. | 2C | |
Lecture: Igneous rock is formed when melted rock cools and hardens into solid rock. This type of change can occur at Earth's surface or below it.
Sedimentary rock is formed when layers of sediment are pressed together, or compacted, to make rock. This type of change occurs below Earth's surface.
Metamorphic rock is for... | 2C | |
Lecture: A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater... | 0A | |
Lecture: Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean.
Question: Which ocean is highlighted?
Choices:
A. the Southern Ocean
B. the Atlantic Ocean
C. the Arctic Ocean
D. the Indian Ocean
Answer with the letter. | 3D | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 1B | |
Lecture: People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to... | 2C | |
Lecture: An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat... | 1B | |
Lecture: An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells.
Question: Which property matches this object?
Hint: Select the better answer.
Choices:
A. salty
B. yellow
Answer with the letter. | 0A | |
Lecture: An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in... | 0A | |
Lecture: An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Question: Which property matches this object?
Hint: Select the better answer.
Choices:
A. slippery
B. salty
Answe... | 1B | |
Lecture: An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with th... | 0A | |
Lecture: Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar ... | 2C | |
Lecture: An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells.
Question: Which property matches this object?
Hint: Select the better answer.
Choices:
A. yellow
B. shiny
Answer with the letter. | 1B | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 1B | |
Question: What is the capital of Delaware?
Choices:
A. Pierre
B. Portland
C. Dover
D. Wilmington
Answer with the letter. | 2C | |
Lecture: A material is a type of matter. Wood, glass, metal, and plastic are common materials.
Question: Which material is this cup made of?
Choices:
A. plastic
B. metal
Answer with the letter. | 0A | |
Lecture: A force is a push or a pull that one object applies to another. Every force has a direction.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling.
Question: What is the direction of this pull?
Hint: A huge magnet moves metal in a junkyard... | 0A | |
Lecture: Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two... | 2C | |
Lecture: The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pa... | 0A |
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