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Unformatted text preview: Physical Geology 101 Weathering and Soil (p. 166-182) Disintegration of Rock Rocks exposed to the elements break down into smaller particles called _____________ which eventually breaks down further to form ___________. This process is called weathering. Definition of weathering: ______________________________________________________ Definition of erosion: _________________________________________________________ Definition of mass wasting: ____________________________________________________ Weathering takes place where the 4 earth systems lithosphere, atmosphere, hydrosphere, and biosphere can interact with each other. i.e., at the Earth's surface. How deep can weathering penetrate into the Earth? ____________________________ Descriptions of the two kinds of weathering: • _______________ : rock is physically broken down but the minerals don ’ t change • _______________ : rock is broken down by chemical or biochemical alteration of minerals, or by dissolving minerals and removing them in solution. Mechanical Weathering Any weathering that involves the physical breakdown of rock is called mechanical weathering. There are five main types: 1. ________________ : when water freezes and expands, forcing rock to break apart. How much does water expand when it freezes? ____________ What is the process called where fractures in rock are forced apart by the water inside them freezing? _______________________ (this is just another way of saying “frost wedging”) The chunks of rock that then fall off and collect on a slope are called ____________. 2. ______________________: rocks under pressure deep inside the Earth ’ s crust get brought slowly to the surface over geologic time (e.g., by the effect of erosion or mountain building). At the surface, the rocks expand and break apart. The process whereby rocks get uplifted is called ______________________. The rock breaks into thin slabs or sheets during uplift. The fractures between these slabs of rock are called __________________. Physical Geology 101 The process that produced these thin slabs or sheets is called _________________....
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This note was uploaded on 01/13/2012 for the course GEOL 101 taught by Professor Williams,t during the Fall '08 term at Idaho.
- Fall '08