Craters on Mars Have Flatter Bottoms and Their Rims Appear

question 10

Multiple Choice

Craters on Mars have flatter bottoms and their rims appear to be more worn down than those on either Earth's Moon or Mercury. What has caused this wear?

• A) breakdown of the rocks by the extreme temperature variations between day and night
• B) erosion by the seasonal fall and subsequent melting of carbon dioxide snow
• C) erosion by wind and infilling by dust storms
• D) erosion by rainfall, now and in the past

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