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Lecture 14

GEOG 1280 Lecture 14: Lecture 14

3 Pages

Course Code
GEOG 1280
Bruce G.Erickson

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Southern California Fires October 2007 and September 2009 Case Study of Natural Hazards Fires in Southern California Santa Ana winds, blowing easttowest across Southern California, are a phenomenon of geography as well as meteorology. When highpressure air moves south into Nevada, Utah and Arizona, it pushes air up and over the San Gabriel Mountains. The air moves down the west side of the mountains, accelerating through canyons into Southern California. Air is compressed by adiabatic (change in pressure related to change in temperature) processes as it descends and is heated up. Santa Ana winds occur most often in the fall, typically gust up to 50 to 70 kmhour and warm the air by about 510 degrees. Temperatures have reached to over 30 degrees, 10 degrees above normal. The air becomes very dry, with the relative humidity dropping below 10 percent. Unit 5 Earth Processes Structure The nature and arrangement of landform materials Process that refers to all phenomena associated with the shaping of geologic structures and material It includes endogenous processes (diastrophism and volcanism) and exogenous processes (mass wasting, weathering and erosion) Stage Sequential changes accomplished by processes as they shape the structure the amount of work done. The process operates in such a way that a sequence of events occurs. The amount of change. Key Terms Exogenic (Exogenous) Processes that occur at or near the Earths surface that wear away (denudation) its surface; powered by isolation (Sun) which provide the energy for water, air and ice, under the influence of gravity. Endogenic (Endogenous)
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