Deserts and Winds
اسلاید 1: Ch 13: Deserts & WindsToday:
اسلاید 2: “We don’t survive the desert, we live here” - Pima Indian
اسلاید 3:
اسلاید 4: 1) Deserts: where & whyDeserts & windsEarth’s dry regions: 30% of all land2 climate types of dry regions: desert (arid) steppe (semi-arid, surrounds deserts)Question: how much rain do we get in Tempe every year?
اسلاید 5: 1) Deserts: where & whyDeserts & windsWhat causes deserts? air pressure windImportant factors:Global distribution of rainfall evaporationRelationship betweenwww.weatherchannel.com
اسلاید 6: 1) Deserts: where & whyDeserts & winds
اسلاید 7: 1) Deserts: where & whyDeserts & windsLow-latitude deserts Tropic of Cancer Tropic of Capricorn(recall: “latitude” = east-west line on the globe) Equator: hot air rises to 15-20 km low pressure beltIn contrast….
اسلاید 8: 1) Deserts: where & whyDeserts & winds
اسلاید 9: 1) Deserts: where & whyDeserts & winds
اسلاید 10: 1) Deserts: where & whyDeserts & winds
اسلاید 11: 1) Deserts: where & whyDeserts & windsMiddle-latitude deserts exist in rain shadows.
اسلاید 12: 2) Basin and rangeDeserts & windsBasin and range mountainous desert landscape
اسلاید 13: 2) Basin and rangeDeserts & windsBasin and range mountainous desert landscape
اسلاید 14: 3) Wind erosion/ depositsDeserts & windsWind erosion: Important in arid environmentsExample: Types of sand dunes:Sand dune shape depends on:Flat or hilly?How much sand?Winds steady or intermittent?Wind direction constant?Vegetation present?
اسلاید 15:
اسلاید 16: 3) Wind erosion/ depositsDeserts & windsSand dune formation
اسلاید 17: 3) Wind erosion/ depositsDeserts & windsDesert pavement
اسلاید 18: 3) Wind erosion/ depositsDeserts & winds
اسلاید 19:
اسلاید 20: 3) Wind erosion/ depositsDeserts & windsGraded beds
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