GEO 101 Lecture Notes - Lecture 10: Ultimate Tensile Strength, Abrasive Blasting, Hydrolysis
26 Jul 2020
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Document Summary
Weathering is the breakdown of rocks in place. Freezing and thawing (contracting and expansion) of water. Can sheets of rock to slough off. Scraping of the rock surface by airborne/bouncing particles. Causes dents and pits in the rock. Moves rocks so that they bump against one another. Exerts a pressure on the walls of the rock. Outer layer of the rock is heated during the day. Outer layer of the rock peels away. Weak acids in rainwater break down rock surfaces. Buildings and statues made from rock are damaged. Water separates to release hydrogen h+ ions and the oh- H ions react with minerals and replaces other ions in the minerals. Oxygen molecules o2 take up those e- and combine with fe. Fungi supplies minerals and protect the algae. Algae provides food (photosynthesis) for both organisms. Minerals can be consumed by some algae. Holes and gaps continue to develop on the rock.
