6.6. In Wikipedia, look up "Impact crater" and answer this question: Why are impact craters not the dominant geographic feature on Venus, Mars, Europa, Io, and Titan?a. Because these bodies have not been hit with very many asteroids or comets through their history.b. Because craters on these bodies become eroded, buried, or transformed by tectonics over time.c. Because the surfaces of these bodies are too weak to form impact craters when hit be asteroids or comets.

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