Notes - Chapter 15 for Fred wrinkler PDF

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Chapter 15 for Fred wrinkler...

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Chapter 15 ○ Weathering ■ physical/mechanical- particles get smaller ■ Chemical- change composition of the rock or the minerals of the rocks ○ Disequilibrium ■ In the earth- high ^ (pressure in the earth), little water, oxygen has low in gas, CO2 has little ■ On the earth-lower, amount of water is high, oxygen is high (21%), CO2 its higher (.004%) ○ Why does weathering occur? ○ Pre Existing joints ■ The features were joints ■ It's been uplifted, the volume went up and fractured, the chemical of the rock went up. ○ Expansion Joints ■ Expands due to pressure ■ It creates Unloading after the pressure and the expansion, ■ Sheep joints ■ Exfoliation joints-sheet joints are surface-parallel fracture systems in rock, and often leading to erosion of concentric slabs. ■ On the earth ○ Physical weathering process ■ Roots wedging ● More precipitation ■ Water expands when it gets cold ■ Frost wedging ● It has to be cold ● Only in the mountains ■ Mineral wedging ● desert , a mineral crystallizes and has pressure on the rock and it breaks ■ Abrasion ● Like when you scrape your knee, the skin falls off ■ Burrowing ○ Changing a rock’s environment promotes weathering ■ Rate of the weather decreases ○ Chemical weathering ■ Disolution (dissolve)- salt in water dissolves and you get salty watter ● NaCl+H20 ■ Hydrolysis- water falls in the atmosphere then itll get the simplest reaction ● H20+CO2->H2CO2 palmonic acid ■ Oxydation ■ Chemical weathering

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● Ions in solutions Basalt ● Silica solution Adsite ● Clay minerals Perditite ● Quartz H7 Granite Role of Gravity in Slope Stablility ■ Gravity acts vertically so block will not move on a flat surface....