Millions of years ago a giant meteorite killed all of the dinosaurs. Will humans be killed in the same way? Students learn what they can do then read a science fiction story where Earth is threatened by a massive comet.

Comets 2009, Perfection Learning

ISBN-13: 9780789178992

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Comets 2009, Perfection Learning, Logan, Iowa

ISBN-13: 9780756992774

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Comets 2007, Ransom Publishing, Watlington

ISBN-13: 9781841674247

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