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Lecture 10

Lecture 10 - Sedimentary Rocks

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Western University
Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 10Sedimentary Rocks y Sedimentary Rocks o Formed by the accumulation and hardening of sediment o Three kinds of sedimentClastic consisting of particles derived from preexisting rocks eg sandChemical consisting of mineral matter precipitated from a solutionBiogenic consisting of materials produced by organisms eg shells bones teeth o WeatheringRocks are broken down by processes of weathering due to dissolution and physical breakdownMechanical Weathering physical breakup or disintegration of rocks without changes in their composition mainly by physical agents like water wind and ice y Breaks the rock into smaller particlesChemical Weathering breakdown or decomposition of minerals due to chemical reaction of minerals with water or gases in the air y For minerals in igneous rocks resistance to weathering basically follows the reverse trend of same trend as the order of crystal
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