Question

Cretaceous extinction... The evidence tells you that “overwhelming evidence suggests that the extinction was caused by a 10-km-diameter asteroid that struck Earth.” Suggest at least three lines of evidence that might have led scientists to this conclusion.

Could you please help me with this problem..? I can't find three lines of evidence...
Ms. Sue
http://www.google.com/#q=extinction++asteroid+that+struck+Earth.

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