• The wearing down of landforms by natural processes. On the Earth’s surface, water, wind and ice are the main elements of erosion, but on other planets slower agencies like micrometeorite impact and solar radiation are likely to be of more importance, as in the case of Mercury and the Moon Earth-type erosion due to water and wind seems to be important on Mars, and the atmosphere of Venus is so dense and fast-moving that it must also cause severe erosion.

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