Earth

What arc is created by refraction and light?

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What substance, added to fog, makes smog?
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Which type of eclipse occurs when the earth sits directly between the sun and the moon?
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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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What is the release of water vapor from plants called?
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There are over one quadrillion of what animal on Earth?
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Where is an earthquake's epicenter?
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What is the driest U.S. state?
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Every second, 100,000 cubic feet of water pours over what?
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