Today, Scientists Believe That the Main Reason the Earth Has

question 34

Multiple Choice

Today, scientists believe that the main reason the Earth has had periodic ice ages is:

• A) slow changes in the tilt of our planet's axis of rotation
• B) the grinding of continental plates against each other over the centuries
• C) changes in the composition of the Earth's atmosphere that affect the ozone layer
• D) the fact that the Moon is slowly moving toward the Earth and drawing off heat
• E) no one has any good theories about the cause of the ice ages
• Section 8.4: Life, Chemical Evolution, and Climate Change

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