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14_climate_wind_10_post

14_climate_wind_10_post - 14 Surface Processes 1 Climate...

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01/2005/Lecture 1: 1 mate & Deserts: 1 14: Surface Processes 1 / Climate, Deserts and Wind Sand dunes, Namib desert, Namibia. Photo: R. Swart
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Why this is important Earth’s external heat engine is one of two heat engines that power geologic processes.
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Why this is important Winds can transport fine-grained materials far distances.
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01/2005/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
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01/2005/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
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01/2005/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 Earth’s two heat engines drives geological Earth’s two heat engines drives geological processes. processes.
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01/2005/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
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01/2005/Lecture 1: 8 mate & Deserts: 8 Source of heat: Source of heat: Sun Sun Fig. 1.13 External heat engine
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01/2005/Lecture 1: 9 mate & Deserts: 9 Fig. 20.10 External heat engine Concentrated Diffuse Diffuse Sun’s energy: falls unevenly on Earth’s surface Sun’s energy: falls unevenly on Earth’s surface
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01/2005/Lecture 1: 10 mate & Deserts: 10 Fig. 20.33 External heat engine Sun’s energy: falls unevenly on Earth’s surface Sun’s energy: falls unevenly on Earth’s surface
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01/2005/Lecture 1: 11 mate & Deserts: 11 Fig. 20.11 External heat engine / iClicker Q1a. 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° Q1b. Descending 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°
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01/2005/Lecture 1: 12 mate & Deserts: 12 Heat transfer --> Heat transfer --> currents of currents of air air , water, , water, & ice transfer heat & ice transfer heat from equator to poles from equator 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 30° 30° 30° 30° 60° 60° Rising currents: air cools Sinking currents: air warms
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01/2005/Lecture 1: 13 mate & Deserts: 13 Heat transfer --> currents of air, Heat transfer --> currents of air, water water , & ice transfer heat from , & ice transfer heat from equator to poles equator to poles Fig. 18.10 External heat engine
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01/2005/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 Plate, p. 552 External heat engine
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