Earth

What is the most common element in Earth's atmosphere?

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What substance can layers of decayed plants form over time?
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Which of these is another name for dirt?
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In the U.S., the spring equinox occurs in what month?
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What type of topography describes caves, caverns, and sinkholes?
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How many moons does Earth have?
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What is in the sky if it is overcast?
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What is the opposite of El Nino?
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What type of radar measures radial velocity?
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