Earth
What is the name given to a fossil that best defines a rock layer's age?
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What are the broken-off pieces of glaciers that make it to the open sea called?
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Which country produces about 1/5 of the world's garbage per year?
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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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Advection, freezing and radiation are types of what weather phenomenon?
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What is the name of the limestone formation that rises from a cave floor?
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