Answer to Dictation 1
Researchers say they know when the next ice age will come.
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Answer to Dictation 2
An ice age is a long period of reduction in the temperature of Earth's surface.
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Answer to Dictation 3
The expansion of continental and polar ice sheets and alpine glaciers.
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Answer to Dictation 4
The scientists believe it could be delayed because of human activity.
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Answer to Dictation 5
Global warming could make it very unlikely that the next freeze will arrive on time.
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Answer to Dictation 6
Melting glaciers in the North and South Poles will push back the next ice age.
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Answer to Dictation 7
His team looked at nearly one million years of climate data.
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Answer to Dictation 8
When the amount of ice on the continental ice sheets was stable.
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Answer to Dictation 9
Barker said less ice means a longer gap between ice ages.
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Answer to Dictation 10
Earth's climate is an interconnected system of complex processes.
See the ice age lesson for the whole text.
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