Earth

What instrument measures altitude?

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Which north direction is the geographic meridian plane?
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How long does it take the earth to rotate around its axis?
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The bottom layer of the atmosphere is called what?
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Every second, 100,000 cubic feet of water pours over what?
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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 another name for permanently frozen ground?
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What is another name for an estuary?
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What layer of the Earth is right below the crust?
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