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Risk Assessment __ Effects of Impacts on Earth __ If a comet were to land on earth the effects would be disastrous. The shock wave from the crash landing would travel 30,000 kilometres per hour. It would shatter everything within 200 kilometres. The comet is broken into pieces because of heat impact. The trees that are surrounding the comet burst into flames and the leaves on the trees begin to boil. In the air the rock that had been vapourised cools down and gets smaller the small pieces break the atmosphere of the earth.



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