Earth

What periods of the Earth's history had glaciers covering a lot of the Earth?

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What climate term is the opposite of humid?
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Which of these is not a type of deep-sea sediment?
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How many miles long is an average bolt of lightning?
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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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What is the boiling point of water as measured on the Celsius scale?
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Where in Arizona is the sun blocked 10% of the time?
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What is in the sky if it is overcast?
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From what perspective does a map shows what the earth looks like?
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