See how much you don't know about energy use and energy sources with this quiz from National Geographic.
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See photos of freshwater mammals, such as manatees, hippos, otters, and more, in this photo gallery from National Geographic.
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Natural Disasters --Tornado Pictures -- National Geographic
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Learn how tornadoes form ... and how to get out of their way.
Natural disasters facts, pictures, quizzes, video from National Geographic
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