Earth

What is an underwater boat with its own power and air supply called?

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What is the Hawaiian name for smooth-flowing basaltic lava, often appearing twisted and rope-like?
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What is the nickname of Katmai in Alaska?
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Although beaches can be comprised of any particle, the majority of them consist of what?
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Which of these is not a type of coral-reef shoreline?
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What season has the warmest weather in the U.S.?
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What type of glaciers fill up the gaps between mountains?
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Earth's crust is made of many pieces called ______ plates.
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How many days does it take for the Earth to revolve around the sun?
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