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Rates of Weathering Topic 9 Regents Earth Science The rate of weathering is affected by 1. Climate Humidity - frost action generally increases with humidity (if temperatures are right) ~ need temperatures above and below freezing Temperature - chemical weathering increases with increasing humidity and higher temperatures 1. Climate continued . . . Local prevailing winds - weathering greatest on windward side Other local conditions such as • carbon dioxide concentration (more CO2, more weathering) • urban heat islands (higher temperature, more weathering) Dominant weathering for various climate conditions Weathering and direction Remember Hot humid = highest rate of weathering Cold and dry = slowest weathering 2. Particle size The smaller the particle, the greater the surface area Small particles weather faster than large particles under the same conditions 3. Mineral composition Rock of different composition weather at different rates 4. Exposure The degree to which a rock comes into contact with weathering agents Protected rocks weather more slowly than those completely exposed at the surface Also affects each particle causing it to become more rounded