Earth's Changing Climate Review

Scientists think that a large amount of carbon dioxide was released from rock on the ocean floor from 120 to 80 million years ago and that this led to increased carbon dioxide in the atmosphere.

During this time, energy in the Earth system . . .

• increased, because less energy entered than exited. This is because more exiting energy bounced back toward Earth.

• increased, because more energy entered than exited. This is because more exiting energy bounced back toward Earth.

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Fossil evidence from the time of T-rex (85 to 65 million years ago) shows less energy entered the Earth system than exited, even though energy from the sun didn’t change. How might the amount of carbon dioxide have changed to cause this?

• Carbon dioxide decreased, so there was less energy in the Earth system and less energy absorbed by Earth’s surface.

• Carbon dioxide increased, so there was less energy in the Earth system and less energy absorbed by Earth’s surface.

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A scientist says that even if the amount of energy entering the Earth system from the sun doesn’t change, there can still be less energy entering than exiting the Earth system. What could change in the atmosphere that would cause this?

• Methane could increase, leading to more energy in the Earth system because more exiting energy would be bounced back toward Earth.

• Methane could decrease, leading to less energy in the Earth system because less exiting energy would be bounced back toward Earth.

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Describe the trend in this graph

• the trend is increasing

• the trend is decreasing

• there is no trend

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Which of the following statements is true?

• If carbon dioxide increases, Earth's temperature stays stable

• If carbon dioxide increases, Earth's temperature decreases

• If carbon dioxide decreases, Earth's temperature increases

• If carbon dioxide increases, Earth's temperature increases

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When carbon dioxide in the atmosphere increases, the amount of energy Earth absorbs....

• changes unpredictably

• stays at a constant level

• increases

• decreases

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Earth's rising temperature is due to...

• more volcanoes

• more forest fires

• climate change

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Which of the following choices would cause Earth to get warmer?

• carbon dioxide increases in the atmosphere

• carbon dioxide decreases in the atmosphere

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If methane increases in the atmosphere, what happens to the amount of energy absorbed by Earth's surface?

• stays at a constant level

• increases

• changes unpredictably

• decreases

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If there are more greenhouse gases in the atmosphere, the amount of energy the Earth absorbs...

• increses

• decreases

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