Western Washington University
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This 2 page Class Notes was uploaded by Charlie Lonac on Thursday September 29, 2016. The Class Notes belongs to GEOL 101 at Western Washington University taught by Paul A. Thomas in Fall 2016. Since its upload, it has received 14 views. For similar materials see Introduction to Geology in Geology at Western Washington University.
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Date Created: 09/29/16
Charlie Lonac GEO 101 9/23 Notes 1. The Earth System a. Geologic processes are powered by: i. Solar energy ii. Radioactive decay iii. Gravity 2. Humans and Geology a. About 7 billion people on Earth i. Humans affect Earth as much as Earth affects humans ii. Geologic hazards are normal 3. Geologic Time a. Earth ~ 4.5 billion years old b. Dinosaurs went extinct only 6.6 million years ago 4. The Earth’s Interior a. Crust i. 5 – 70 km deep ii. Rigid, brittle, and thin iii. The crust is what people think as rock when they dig into the ground iv. The crust varies in thickness based on location on the planet v. Continental Crust vs. Oceanic Crust 1. Continental a. Thick b. Older rock c. Light d. Made of many rock types 2. Oceanic a. Thin b. Younger rock c. Dense d. Made of Basalt from the Mantle b. Mantle i. ~2900 km ii. Lithosphere 1. Crust and upper mantle 2. Brittle 3. Moves independently on top of asthenosphere iii. Asthenosphere 1. Lower mantle 2. “plasticky” metals c. Outer Core i. ~1200 km ii. Liquid d. Inner Core i. ~2270 km ii. Metal
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