Earth
What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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What are the broken-off pieces of glaciers that make it to the open sea called?
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What is an underwater boat with its own power and air supply called?
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What is the name of a glacier that is formed when two or more valley glaciers flow together?
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What is the name given to a fossil that best defines a rock layer's age?
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How long does it take earth to revolve around the sun?
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