Earth

How old do scientists think the Earth is?

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What is the top layer of the soil called?
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What energy does Earth give back to space?
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What is the measure of the moisture level of air called?
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How many days a year is the sun invisible at the North Pole?
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What product of burning fossil fuels can cause death by preventing oxygen from getting to cells?
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What word means to degrade naturally?
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When a meander is cut off, what is formed?
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How many days does it take for the Earth to revolve around the sun?
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