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Unformatted text preview: Geology 111 Notes Chapter 1 Geology : The science of the earth. -The relatively high standard of living of people in the United States and Canada is largely due to an abundance of natural resouces such as coal, petroleum, minerals and soils.-Western part of of North America has a more complex appearance because it has numerous mountians and valleys.-The muntains in the East Coast is more subdued, and surrounded by a braod shelf that continues out beneath the Atlantic ocean. 1.1 How Does Geology Influence Where and How We Live?-Geologic features can constrain one to where he/she can live. Geology controls the distribution of energy resources and the materials required to build houses, cars and factories.-Where Should We Live?-Volcanoes can provide nutrients and excellent soils for growing crops. Inhabitants of volcanic region must decide whether the good soils are worth the risk due to the hot volcanic ash and molten lava.-Hillslopes can collapse if they are too vertical. -Strength of underlying materials also determine where it is stable enough to build. -Faults in Earth’s crust causes earthquakes, which can destroy poorly constructed buildings and kill thousands.-Soils near rivers commonly are fertile and capable of growing important crops. Other soils are dangerous to build on because the soil expands when wet, cracking foundations and making structures unsafe.-What Controls the Distribution of Natural Resources?-Mines reflect differences in the ages and types of rocks.-The copper mines are in the mountainous west because this part of the continent was invaded by magma (molten rock), especially around 70 million years ago. These magmas formed distinctive kinds of copper- rich granites and were related to geologic events that occurred only alog the western side of the continent.-I ron mines are by the Great Lakes and Eastern Canada because Rocks of the Canadian Sheild are much older than western copper deposits. I ron rich rocks of this age (2 billion) did not form in most other parts of the contientnt b/c some parts of America did not exist....
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This note was uploaded on 05/17/2011 for the course GLG 111 taught by Professor Kuentz during the Spring '05 term at Miami University.
- Spring '05