G7 T5 L3: Cycle of Matter

What does the law of conservation of mass state?

• Matter can be created and destroyed during chemical changes.

• Matter is neither created nor destroyed during any chemical or physical change.

• Energy is neither created nor destroyed, but matter is not conserved.

• Matter is converted into energy during chemical changes.

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According to the law of conservation of energy, what happens when one form of energy is transformed into another?

• Energy is lost in the process.

• Energy is created during the transformation.

• No energy is lost in the process.

• Energy is only transformed during physical changes.

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What is the definition of evaporation in the water cycle?

• The process by which water vapor condenses into liquid water.

• The process by which heavy drops of water fall from clouds.

• The process by which molecules of water at the surface of liquid water absorb enough energy to form a gas.

• The process by which gas changes to a liquid called condensation.

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What is the process of condensation in the context of the water cycle?

• The process by which water vapor rises into the atmosphere.

• The process of a gas changing to a liquid called condensation.

• The process by which heavy drops of water fall from clouds.

• The process by which water vapor is absorbed by plants and animals.

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What is precipitation in the water cycle?

• The process by which water vapor rises into the atmosphere.

• The process by which water vapor condenses into liquid water on plants.

• The process by which gas changes to a liquid.

• Heavy drops of water fall from clouds.

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What is the role of producers in the carbon cycle?

• They release carbon dioxide and water into the environment.

• They consume other organisms and take in their carbon compounds.

• They break down the remains and release carbon compounds to the soil.

• They take in carbon dioxide gas from the air during photosynthesis and use it to make food.

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Which of the following is a consequence of humans burning fossil fuels like gasoline, natural gas, and plant fuels?

• The number of carbon and oxygen atoms in the air decreases.

• Carbon dioxide is released into the atmosphere.

• There are more producers to absorb carbon dioxide.

• The air around us becomes less nitrogenous.

What happens to carbon dioxide levels when humans clear forests to make farmland or use wood for lumber or fuel?

• Carbon dioxide levels decrease because there are more trees to absorb it.

• Carbon dioxide levels remain constant because the number of trees doesn't affect it.

• Carbon dioxide levels rise because there are fewer producers to absorb it.

• Carbon dioxide levels are not affected by human activities.

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Approximately what percentage of the air around us is nitrogen gas?

• 78%

• 21%

• 55%

• 10%

What happens to the oxygen levels in the atmosphere when humans clear forests for urban development?

• Oxygen levels increase because there are fewer trees to absorb it.

• Oxygen levels remain constant because the number of trees doesn't affect it.

• Oxygen levels decrease because there are fewer trees to produce it.

• Oxygen levels are not affected by human activities.

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