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10. How does the greenhouse gases cause the greenhouse effect?

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10. How does the greenhouse gases cause the greenhouse effect?

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7. What types of ice sheets covered the earth?

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7. What types of ice sheets covered the earth?

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4.Why does the greenhouse gasses have caused temperatures to increase?

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4.Why does the greenhouse gasses have caused temperatures to increase?

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3.What type of human activities increase heat?

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3.What type of human activities increase heat?

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2.Why did temperatures drop below 90 degrees?

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2.Why did temperatures drop below 90 degrees?

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1.What caused the earth to cool down again?

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1.What caused the earth to cool down again?

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The ice is melting and the ocean has risen.

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Ice sheets covered earth.

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Periods of extreme cold is an ice age.

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100 million years ago, the earth's temperature was 18 degrees.

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Earth was cold 2 billion years ago.

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The earth cooled again after 500 years ago.

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Some glaciers were several miles or kilometres high.

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The last ice age was about 18,000 years ago.

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Temperatures dropped below 90 degrees.

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Earth has gone through periods of natural cooling and heating.