Earth

What is an underwater boat with its own power and air supply called?

More Questions from Earth
What breaks when its height is 3/4 of its depth?
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What is the hardest mineral known on Earth called?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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What occurs when the earth is between the sun and moon?
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How long does it take earth to revolve around the sun?
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What is the name for a 100 foot tall tidal wave?
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A weather proverb says "A year of snow," followed by what?
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Which of these types of energy is cleanest and causes the least pollution?
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