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6.3. In Wikipedia, look up "Impact crater", read the intro and then scroll down to "Crater formation", and answer this question: Why are craters nearly always round?a. Because asteroid and comets invariable strike from straight above the surface.b. Because initial contact is always a single point regardless of the impact angle.c. Because they are caused be explosions.d. They are not initially, but subsequent collapse of the crater walls during the modification stage serves to round them.
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