Earth
What word means to degrade naturally?
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What is a plant with no internal system of tube like structures called?
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What percentage of known volcanoes are subaerial, meaning they erupt into the atmosphere?
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What is a sudden and heavy rainfall or downpour called?
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What event is caused by radiation hitting the Earth's atmosphere?
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What is the test that can help determine the hardness of a rock called?
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78% of the earth's atmosphere is composed of which gas?
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