Earth

Which of these types of pollution occurs naturally?

More Questions from Earth
How old is the sun estimated to be?
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Where was the lowest world temperature, -128.6 degrees?
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Which of these is a warm spell of weather when ice and snow melt?
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What event is caused by radiation hitting the Earth's atmosphere?
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What is a region of Earth in which all areas share the same time called?
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What word means a mild or moderate temperature?
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What were water mills used for in the 1700's in Europe?
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Which pairs of minerals are almost always found together?
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