What is the science of water erosion on rocks (details inside)?

What is the science of water erosion on rocks (details inside)?
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answer:Some erosion is due to direct friction of wind, water or sand on the rock’s surface. Large rocks are more quickly broken into smaller pieces when water sleeps in small cracks and freezes, the expansion speeds up the growth of the crack until the rock fractures. The rate that you are asking for depends on the type of rock (soft sandstone or hard granite, for example), rain rates, winds, and other factors. The following article quotes rates on a particular type of rock in Australia that range from 0.15 mm to 2.3 mm per 1000 years. In this case they are concerned about the preservation of petroglyphs from both natural and artificial effects.
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