Details Title: 4-3 Conserving Land & Soil Description: Chapter 4 Section 3 Total Flash Cards: 16 Created: 01/07/2009 20:38:51		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Science Flashcards
Cards in this set: Term list 3 ways people use the land that change the land Definition agriculture, development, mining Term why is soil one of the Earth's most vaulable resources? Definition because every living thing that lives on land depends directly or indirectly on soil Term t/f soil is a non renewable resource Definition false Term t/f soil formation takes a long time. Definition true Term  true or false fertile soil is plentiful Definition false Term  true or false half of the Earth has soils good for farming Definition false Term how can soil be damaged Definition soil can be exhausted polutted lose its fertility *crop rotation keep it fertile r lost all together Term how can soil be lost Definition soil can be lost by erosion Term what is desertification Definition the advance of desertlike conditons into areas that previously were fertile. Term what was the Dust Bowl Definition when parts of Oklahoma and surrounding states lost soil in the 1930's Term why did the Dust Bowl occur Definition they plowed soil to grow crops and the soil became exhausted/exposed?. Then in times of drought, the top soil quickly dried out, turned to dust and blew away. Term what is soil conservation Definition the management of soil to prevent its destruction is referred to as soil conservation Term how does contour plowing help conserve soil? Definition helps slow runoff of excess rainfall and prevents it from washing away soil Term how does conservation plowing help conserve soil Definition it leaves previous crop in the ground to hold soil and moster in place it also reterns nutrens to the soil Term how does crop rotation help conserve soil? Definition it varies crops in order to use fewer nutrients or to restore nutrients to soil Term how does planting windbreaks help conserve soil? Definition it blocks the wind and traps eroding soil