14_climate_wind_09_post

14_climate_wind_09_post - 101/2005/Lecture 1: 1 mate...

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Unformatted text preview: 101/2005/Lecture 1: 1 mate & Deserts: 1 14: Surface Processes 1-- Climate, Deserts and Wind Sand dunes, Namib desert, Namibia. Photo: R. Swart Why this is important Earths external heat engine is one of two heat engines that power geologic processes. Why this is important Winds can transport fine-grained materials far distances. 101/2005/Lecture 1: 4 mate & Deserts: 4 Winds are capable of severe soil erosion in arid or semi-arid lands, especially during prolonged droughts. Why this is important 101/2005/Lecture 1: 5 mate & Deserts: 5 Fertile soils in the Midwest are deposits of fine silt transported by winds from the edge of ice sheets. Why this is important 101/2005/Lecture 1: 6 mate & Deserts: 6 Heat engines Just like heat from the burning of gas in an Just like heat from the burning of gas in an automobile engine drives a car, heat from automobile engine drives a car, heat from Earths two heat engines drives geological Earths two heat engines drives geological processes. processes. 101/2005/Lecture 1: 7 mate & Deserts: 7 Internal heat engine : heat transfer from hot interior to cold exterior results in plate movement, earthquakes, volcanic activity, and mountain-building Heat engines 101/2005/Lecture 1: 8 mate & Deserts: 8 Source of heat: Source of heat: Sun Sun Fig. 1.13 External heat engine 101/2005/Lecture 1: 9 mate & Deserts: 9 Suns energy: falls unevenly on Earths surface Suns energy: falls unevenly on Earths surface Fig. 20.10 External heat engine Concentrated Diffuse Diffuse 101/2005/Lecture 1: 10 mate & Deserts: 10 Fig. 20.33 External heat engine Suns energy: falls unevenly on Earths surface Suns energy: falls unevenly on Earths surface 101/2005/Lecture 1: 11 mate & Deserts: 11 Fig. 20.11 External heat engine / iClicker Q1. Rising currents of air occur at or near latitude: A. 0 and 30 B. 0 and 60 C. 30 and 60 D. 30 and 90 E. 60 and 90 101/2005/Lecture 1: 12 mate & Deserts: 12 Heat transfer --> Heat transfer --> currents of currents of air air , , water, & ice transfer water, & ice transfer heat from equator heat from equator to poles to poles Effects of heat Effects of heat transfer: currents transfer: currents produce erosion, produce erosion, transportation, transportation, deposition deposition Fig. 20.11 External heat engine 0 0 30 30 30 30 60 60 101/2005/Lecture 1: 13 mate & Deserts: 13 Heat transfer --> currents of air, Heat transfer --> currents of air, water water , & ice transfer heat , & ice transfer heat from equator to poles from equator to poles Fig. 18.10 External heat engine 101/2005/Lecture 1: 14 mate & Deserts: 14 Hydrologic cycle : day-to-day & long-term changes that occur within the hydrosphere driven by external heat engine Plate, p. 552 External heat engine 101/2005/Lecture 1: 15...
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14_climate_wind_09_post - 101/2005/Lecture 1: 1 mate...

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