Earth
What type of boundary is displayed at the Mid-Atlantic Ridge?
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What is another name for permanently frozen ground?
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What theory proposes that Earth's landmasses were once connected and drifted apart?
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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 of the submerged fringe of a continent?
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What is the name given to a fossil that best defines a rock layer's age?
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What type of scientist studies microscopic plants and animals?
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