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What is an LED?

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What is magma, which has surfaced through a volcanic eruption?
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What is caused when the Moon moves into the Earth's shadow?
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What tool do people at sea use to measure distance with echoes?
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What does Earth's tilted axis mainly affect?
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Which scientific term is defined as the rate at which a wave oscillates in cycles?
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What causes the moon to shine?
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What is water stored beneath the surface of the Earth called?
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The obscuring from sight of one celestial body by another is also by what scientific term?
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