ERTH 20 Lecture Notes - Lecture 19: Biotite, Mass Wasting, Feldspar
2 Dec 2020
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Document Summary
Metamorphism = sum of all changes due to change in environmental conditions the. Met rocks make up 60% of crust. Heat energy breaks and reforms atomic bonds. Hot water with dissolved ions and volatiles. The type of metamorphic rock and the minerals that you get are a function of. Shale sedimentary rock- turns to slate metamorphic rock. If the slate is buried more deeply. External (surficial) process- like weathering, erosion are powered by energy from the sun. Internal processes- like earthquakes, volcanic activity, plate motion- are powered by the heat energy inside the planet. Rock is disintegrated and decomposed 9physical and chemical weathering) moved to lower elevations by gravity (mass wasting) and carried away by water, wind, or ice. Mechanical weathering breaks rock into smaller pieces, more surface area is. Weathering agent because liquid water turns to ice and increases volume. Salt wedging- salt water gets in cracks forms salt crystals. Biological activity- plant wedging itself into crack.
