Deserts and Winds

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0 6 یو :۱0۲06 نسم Fe 

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Motorist killed, flights grounded wepnespay ۰ SULY 7, 1999 

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hy reqow: 90% of did 6 olkodte types OP dy rewow: © cert (wid) © Seppe (sewtan, surround deserts) Question: how much rain do we get in Tempe every year? 

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Deserts & wards 1 ) Deserts: where وود ‎Oke vawes‏ توص( موسوم و <ه مسشحا بط لام © we presse © tert 

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Dbow-hiude deveris (recall: “hitude” = cust west hoe oa the dob) © Drop oP Cawer © Drop oP Cupricora ای و ‎Gq:‏ ® ‎hot air‏ * ‎res ty 16-OO kw‏ * ‎bow presowe bet‏ * 

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oe Equator aa ۳ dey aie cal Res” descends ending air warms, 30° evaporates surface water 

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و Global air circulation. Red arrows show surface winds. Blue arrows show vertical circulation of air. Air sinks at 30°N and 30°S. latitude (and at the poles). 

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Hot deserts Northeast trades \\ Hot deserts Southeast trades / 

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‎deveris‏ نو و(() .وسط كاد ماسر جا ارج © ‎Rain from expansion and cooling ‎ ‎Evaporation ‎from ‎compression ‎and warming 

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Desire Sone 2) Basin and range Own ard rare °° wontons devert hradsvope ۲28 ountain range naa ees \ df ۳ Mountain range 

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جلوص موی له و وتو لوط Grave: Types oF sand duces: Gued duce shope depeuds oc! "Phat or billy? “Wow work sand? "Oieds steady or istercvittect? "Oied ‏سوه مس‎ ‏سم نیو ن*‎ 

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Wind erosion 

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مه سمل ‎Good‏ deposited here in calm air yy ۳ = ee, 

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a 3) Wind erosion/ depos Deserts & wires 

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| ee a 3) Wind erosion/ deposits : SS MS ‏ات‎ pavement. BOQ BOQ Be BS Cea ‏سب‎ we coarse and fine Wind Nd ratty removes Desert pavement prevents particles at surface finer particles further wind erosion (b) 

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Deserts & winds 3) Wind erosio Sand dunes 

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a 3) Wind erosion/ depos (Graded beds 

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ها ام راجیب همم ۳ is howe to over ‏لامج و‎ powerpoidts subsvited by teachers. Mhis is 0 vowpletely Pree site ued requires uv reysiraiod. (Please visit ond | hope it wil help ict pour ‏ها‎ 

Today: Ch 13: Deserts & Winds “We don’t survive the desert, we live here” - Pima Indian Deserts & winds 1) Deserts: where & why 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? Deserts & winds 1) Deserts: where & why What causes deserts? Important factors: Global distribution of  air pressure  wind Relationship between  rainfall  evaporation www.weatherchannel.com Deserts & winds 1) Deserts: where & why Deserts & winds 1) Deserts: where & why Low-latitude deserts (recall: “latitude” = east-west line on the globe)  Tropic of Cancer  Tropic of Capricorn In contrast….  Equator: hot air  rises to 15-20 km  low pressure belt  Deserts & winds 1) Deserts: where & why Deserts & winds 1) Deserts: where & why Deserts & winds 1) Deserts: where & why Deserts & winds 1) Deserts: where & why Middle-latitude deserts  exist in rain shadows. Deserts & winds 2) Basin and range Basin and range  mountainous desert landscape Deserts & winds 2) Basin and range Basin and range  mountainous desert landscape Deserts & winds 3) Wind erosion/ deposits 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? Deserts & winds 3) Wind erosion/ deposits Sand dune formation Deserts & winds 3) Wind erosion/ deposits Desert pavement Deserts & winds 3) Wind erosion/ deposits Deserts & winds Graded beds 3) Wind erosion/ deposits This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.