GEOL107 Study Guide - Midterm Guide: Silicic Acid, Calcite, Kaolinite
26 Sep 2017
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Document Summary
Physical geology today what is weathering? into smaller pieces. Importance of all forms of mechanical weathering is that they cause rock to break. Mech weathering causes rock to break into smaller pieces. Smaller pieces of rock, greater amount of surface area of rock exposed to chemical wethering , thus faster rock will weather. When rock has cracks with water and when water freezes, expansion due to ice exerts. Understand the general reactions of chemical weathering - you should be able to give examples of what minerals weather by each of the reactions. Three most important agents of chem weathering. These agents react with exposed surface area of rocks and minerals to cause chem weathering. Carbonic acid (hydrogen cation) with some additional water reacts with mineral orthoclase feldspar to form mineral kaolinite with some additional dissolved potassium and dissolved silica. 2k+ + 4sio2 (dissolved potassium and silica and dissolved silicic acid. Silicate minerals - simple - weather slowly.
