Earth

Where in Arizona is the sun blocked 10% of the time?

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What did ancient farmers probably use to tell the passing of seasons?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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What type of radar measures radial velocity?
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Earthquakes sometimes cause "tidal" what?
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What kind of scientist would study rocks, minerals and mountains?
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Who first charted the Gulf Stream?
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What type of fault is the San Andreas Fault?
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How many moons does Earth have?
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