chapter_20_powerpt.CM-11e

chapter_20_powerpt.CM-11e - Mountain Belts and the...

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Steve Kadel, Glendale Community College Mountain Belts and the Continental Crust Physical Geology 11/e, Chapter 20
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Mountain Belts and Earth’s Systems Mountain belts are chains of mountain ranges that are 1000s of km long Commonly located at or near the edges of continental landmasses Composed of multiple mountain ranges Mountain belts are part of the geosphere Form and grow, by tectonic and volcanic processes, over tens of millions of years As mountains grow higher, erosion by running water and ice ( hydrosphere ) occur at higher rates Air ( atmosphere ) rising over mountain ranges directly results in precipitation (rain and snow) and erosion
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View of glaciated peaks in one of the mountain ranges in View of glaciated peaks in one of the mountain ranges in the Andes mountain belt the Andes mountain belt
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Characteristics of Mountain Belts Mountain belts are very long and extensive compared to their width The North American Cordillera runs from southwestern Alaska down to Panama Older mountain ranges (Appalachians) tend to be lower than younger ones (Himalayas) due to erosion over time Young mountain belts are tens of millions of years old, whereas older ones may be hundreds of millions of years old Even older mountain belts ( billions of years) have eroded nearly flat and form the ancient stable cores ( cratons ) of the continents Shields - areas of cratons laid bare by erosion
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Map of the world showing major mountain belts Map of the world showing major mountain belts
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The mountain belts and craton (including the Canadian The mountain belts and craton (including the Canadian Shield) of North America. Shield) of North America.
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This note was uploaded on 06/13/2011 for the course GEOL 1403 taught by Professor Mulcahey during the Spring '11 term at Lone Star College System.

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chapter_20_powerpt.CM-11e - Mountain Belts and the...

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