download Dirt: The Erosion Of Civilizations read online Como resultado de lluvias sobre el suelo, desnudo o cubierto, donde el flujo de agua lleva láminas de este hacia el gradiente, transportando una suspensión de partículas.Cuando la precipitación excede la infiltración, se produce escurrimiento con transporte de suelo. …
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civilizations to Civil War plantations and the dust bowl era. For the past 10,000 years the iconic act of plowing the Earth has exacted a heavy toll that few realize.
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Scardanelli Rainfall, and the surface runoff which may result from rainfall, produces four main types of soil
erosion: splash
erosion, sheet
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Dirt: The Erosion of Civilizations. University of California Press, 2008; Dayton Duncan: The Dust Bowl - An Illustrated History. Chronicle Books, San Francisco 2012, ISBN 9781452107943 Christophe Masutti: Les faiseurs de pluie.Dust Bowl, écologie et gouvernement (Etats-Unis, 1930-1940), DHVS/Univ. Strasbourg, sous licence CC-By-Sa, 2012. For better or for worse, agriculture was a driving force behind the growth
of civilizations. Farming probably involved more work than hunting and gathering, but it is thought to have provided 10 to 100 times more calories per acre. 5 More abundant food supplies could support denser populations, and farming tied people to their land. Small settlements grew into towns, and towns grew into cities. 1 Bodenerosion ist die übermäßige
Erosion von Böden, verursacht durch unsachgemäße menschliche Landnutzung, zum Beispiel Entfernung der schützenden Vegetation durch Überweidung oder Abholzung, sowie zu kurze Brachezeiten.Besonders problematisch ist hierbei der Verlust des Oberbodens, das heißt des fruchtbarsten und landwirtschaftlich bedeutendsten Teils der Böden. Dirt: The Erosion Of Civilizations mobi download Die tiefen Wurzeln des Präriegrases, dessen Halme den Staub auffingen, hatten die oberen Bodenschichten vor
Erosion bewahrt, die nun massiv einsetzte. Durch Trockenheit und Staubstürme wurden die Ernten vernichtet und die Menschen in ihren Häusern regelrecht eingeweht. FOUNDRY
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Wink, Poppy, Midnight Soil erosion is the displacement of the upper layer of soil, one form of soil degradation.This natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, animals, and humans.
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