Statistics for Soil Part 3

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Hint	Answer	% Correct
Creation of Soil	500 years to make 1 inch of topsoil can be easily lost to erosion -> qualifies as nonrenewable, agriculture needs around 6 in of topsoil, in the past 40 years, lost 1/3 of crop land bc of soil degredation	0%
Soil Ecosystem	bacteria fix nitrogen, fungi on tree roots help w/ absorption, decomposer break down leaf litter, organisms mix soil, animals burrow -> aeration, animal feces fertilize soil	0%
Soil Conservation Methods	contour plowing, cover crops, no-till, strip-cropping, terracing, shelterbelt/windbreak	0%
Ways we negatively affect fertility	deforestation, overgrazing, urbanization, irrigation, monoculture	0%
Lost Topsoil	ends up water ways, increase in water pollution, increase in turbidity, less light gets in, less photosynthesis for plants	0%
General ways we modify soil	fertilizer, liming -> add base to neutralize acid, deforestation -> increase in erosion and compaction, more water runoff	0%
Causes of soil degradation	overgrazing, deforestation, agriculture, fuelwood gathering (using trees to make charcoal)	0%
Other Soil conservation measures	soil conditioning, planting leguminous plants, crop rotation, forestation/ reforestation	0%