Earth

What arc is created by refraction and light?

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What does the Saffir-Simpson scale measure?
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In what month does a "Milk Moon" occur?
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On October 11, 1999 the world population hit a milestone of how many?
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What is an underwater boat with its own power and air supply called?
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Which of these is not a type of coral-reef shoreline?
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What igneous formation is usually seen in the core of folded mountains?
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What do the Japanese call a hurricane?
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What fuel comes from the remains of 300-million-year-old decayed fern plants?
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