Earth

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

More Questions from Earth
Which of these planets is smaller than Earth?
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What does Earth do to cause night and day?
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How are pockets of air in soil made?
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What type of clouds are thick and puffy and can sometimes turn into thunderstorms?
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From which does the Global Positioning System receive its information?
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On which canal would a traveler find Port Said?
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A phytotoxin is a poison produced from what?
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What is in the sky if it is overcast?
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