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Which of these types of energy is cleanest and causes the least pollution?
Earth
Which of these types of energy is cleanest and causes the least pollution?
Natural Gas
Gasoline
Coal
Wind
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Which of these is a body of salt water?
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What zone is between the Earth and the atmosphere?
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What polluting material can choke an animal by getting caught around its neck?
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What is moving air called?
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Alaska and what state have record highs of 100 degrees?
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What is the only continent on Earth that does not have snakes?
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The average rain drop falls at a rate of how many feet per second?
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