Earth

What is another name for permanently frozen ground?

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Which volcano in Iceland was once thought to be a gateway to the underworld?
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What is the study of plant life called?
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What is a front that does not advance called?
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How many days a year is the sun invisible at the North Pole?
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What is the largest natural carbon sink on earth?
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What is petroleum as found in the earth, before it is refined?
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What is the name for a 100 foot tall tidal wave?
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Earth's crust is made of many pieces called ______ plates.
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