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Earth
How old is the earth?
Earth
How old is the earth?
5 million years
4.5 billion years
40 billion years
1 billion years
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How often is the earth hit by lightning?
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In the United States, summer officially begins in which month?
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About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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Which of the following lakes has a higher salt content than normal?
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What word is generally used to describe visible air pollution?
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