Earth

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

More Questions from Earth
What kind of calendar traditionally predicts the weather?
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What must happen for a tree to become a fossil?
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What acidic precipitation occurs when sulfur dioxides build up in the clouds?
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What event can cause much damage from the shaking of the Earth's crust?
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Mount St. Helens erupted in what U.S. state?
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What is the most common element in Earth's atmosphere?
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What is the common name for the Cenozoic Era?
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Which of the following minerals is the hardest?
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