Earth
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 weather-related season is between June 1 and November 30 in North America?
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What are large volcanoes that rise from the sea floor called?
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What type of fossils give only evidence of activities of past living creatures?
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What soft brown coal that has lost all of its moisture called?
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