Frozen Water Discovered on "Deep Impact" Comet

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In this National Geographic News article, read about the Deep Impact mission to comet Tempel 1. Data and images from the mission verify that comets are composed of water ice, and this fuels the theory that the water on Earth may have come from comets colliding with our planet. Links to other stories, photos, videos and Web sites are also found on this page.

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    Grade: 3 to 12

    Topics: Earth & Space Science, Science, History-Social Science, American Democracy

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