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I wrote a letter to a friend yesterday afternoon. I must put a stamp on the envelope and post it on my way to school.

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Does Mars's surface experience any meteorite impacts today?a. No, Mars's atmosphere is very thick and protects the surface even from large meteorites.b. Yes, we can see a lot of craters on the surface of Mars.c. Sometimes. The atmosphere of Mars protects the surface from micrometeorites, but larger meteorites may occasionally impact the surface.d. Yes, the atmosphere of Mars is very thin and its effect is negligible even for micrometeorites.
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