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Transcript of Sahara Desert
3.5 million square miles
10% of the continent
Largest hot desert in the world http://4.bp.blogspot.com/-MpD5XW7MZ7o/T66Bio6kOCI/AAAAAAAAJLU/pGhu7E3CTRw/s1600/sahara_desert.jpg History of the Sahara Desert Geologic History mostly shaped by wind
sand dunes, salt flats, dry valleys, and gravel plains
Nile River: main water source
Center: little to no vegetation
North and South have grass lands, desert shrubs, and some trees
Last Ice Age (8000 BCE-6000 BCE [Before Common Era]) when the Sahara Dessert gained a lot of precipitation
3400 BCE: a monsoon came from the South and dried up the area again
10% precipitation each year
86 degrees is the average temperature
Reaches to about 122 degrees
Record was 136 degrees in Aziziyah, Libya Not 'dessert'... you want 2 of those ;) http://25.media.tumblr.com/tumblr_lpfupmkgCF1r101feo1_400.jpg http://1.bp.blogspot.com/-fr6lJJvK4dQ/T1Cegnj-HVI/AAAAAAAAHS0/hCyN3ebLZoM/s1600/sahara-desert-6.jpg WOAH! Fun Fact! :D A sand dune in the Sahara Desert can reach up to 500 feet! Human History People have been here since 6000 BCE
Egyptians, Phoenicians, Europeans, and Greeks
4 million in population living in Algeria, Egypt, Libya, Mauritania, and the Western Sahara http://cache.virtualtourist.com/6/1486024-Desert_tracks_from_Zouerat_to_Bir_Moghrein_Mauritania.jpg http://anthonyarden.files.wordpress.com/2011/08/img_1858.jpg Sandstone http://skywalker.cochise.edu/wellerr/rocks/sdrx/6srx-sandstone-quartz-2.jpg Rich in iron ore
Consists of some quartz pieces
Limonite-gives yellowish color http://skywalker.cochise.edu/wellerr/rocks/sdrx/6srx-sandstone-quartz-2.jpg Medium sized texture (1/16-2mm [sugar sized])
Sand gets compressed and squeezes out moisture Sahara Desert vs. Earth's Spheres Cacti absorb water so they can live Bioshphere Hydrosphere Geosphere Water evaporates to create salt flats and mud cracks Atmosphere Wind blows sand to create sand dunes Provides animals and other plants with water Uses the surrounding land to make a home Recreational Uses People do not normally live in cities but in nomads
Some cities and villages have fertile areas for crops
Mining for iron in Algeria
Copper in Mauritania http://www.etftrends.com/wp-content/uploads/2009/04/copper4.jpg http://images-of-elements.com/iron-2.jpg The Sahara in the News! The Ivory Coast had a Cocoa Output that produces beans, got destroyed by the Sahara Desert winds in late December and early January. http://www.bloomberg.com/news/2013-01-23/ivory-coast-cocoa-crop-spared-damage-from-sahara-winds.html Bibliography Category. (n.d.). Sahara Desert - The Sahara Desert in Africa. Geography Home Page - Geography at About.com. Retrieved February 17, 2013 The Sahara Desert. (n.d.).thunderbolts.info | A voice for the Electric Universe. Retrieved February 17, 2013 Ivory Coast Cocoa Crop Spared Damage From Sahara Winds - Bloomberg. (n.d.).Bloomberg - Business, Financial & Economic News, Stock Quotes. Retrieved February 17, 2013 Bailey, E. (n.d.). How Plants & Animals Rely on Each Other in the Desert | eHow.com. eHow | How to Videos, Articles & More - Discover the expert in you. | eHow.com. Retrieved February 17, 2013 Describe the sequence of events in the lithification of a sandstone.? - Yahoo! Answers. (n.d.). Yahoo! Answers - Home. Retrieved February 17, 2013 How it affects other environments
Sand does not absorb water well
Dries out crops
Sand, at the edge of a body of water, can distinguish the direction of ripple marks
http://www.amrefcanada.org/silo/images/kenya-drought-girls-with-dead-crops_290x193.jpg http://www.sciencephoto.com/image/84427/350wm/C0020087-Ripple_marks_in_submerged_sediments-SPL.jpg GEOL 102 Terrestrial Sedimentary Environments. (n.d.). University of Maryland, Department of Geology. Retrieved February 17, 2013