Deserts and Wind

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Ch 13: Deserts & Winds Today: This Powerpoint is hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints

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“We don’t survive the desert, we live here” - Pima Indian

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1) Deserts: where & why Deserts & winds Earth’s dry regions: 30% of all land 2 climate types of dry regions: desert (arid) steppe (semi-arid, surrounds deserts) Question: how much rain do we get in Tempe every year?

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1) Deserts: where & why Deserts & winds What causes deserts? air pressure wind Important factors: Global distribution of rainfall evaporation Relationship between www.weatherchannel.com

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1) Deserts: where & why Deserts & winds

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1) Deserts: where & why Deserts & winds Low-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 belt In contrast….

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1) Deserts: where & why Deserts & winds

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1) Deserts: where & why Deserts & winds

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1) Deserts: where & why Deserts & winds

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1) Deserts: where & why Deserts & winds Middle-latitude deserts exist in rain shadows.

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2) Basin and range Deserts & winds Basin and range mountainous desert landscape

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2) Basin and range Deserts & winds Basin and range mountainous desert landscape

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3) Wind erosion/ deposits Deserts & winds Wind erosion: Important in arid environments Example: Types of sand dunes: Sand dune shape depends on: Flat or hilly? How much sand? Winds steady or intermittent? Wind direction constant? Vegetation present?

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3) Wind erosion/ deposits Deserts & winds Sand dune formation

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3) Wind erosion/ deposits Deserts & winds Desert pavement

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3) Wind erosion/ deposits Deserts & winds

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3) Wind erosion/ deposits Deserts & winds Graded beds

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