Earth

What activity allows humans to go underwater with oxygen tanks and a wetsuit?

More Questions from Earth
What is petroleum as found in the earth, before it is refined?
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Where in Arizona is the sun blocked 10% of the time?
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What word means "the shakes that come after the earthquakes"?
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What is the boiling point of water as measured on the Celsius scale?
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What soft brown coal that has lost all of its moisture called?
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What word is generally used to describe visible air pollution?
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Snow particles that have blown into a pile are said to form what?
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What is the term for the Earth's crust where it underlies oceans?
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