Vocab 103-122 (Soil/Geology, Toxicology, and Water)

cheaper and can remove more minerals; less hazardous to workers

a rock that contains a large enough concentration of a mineral making it profitable to mine

organic, dark material remaining after decomposition by microorganisms

removal of dissolved materials from soil by water ,moving downwards

deposit of leached material in lower soil layers (B horizon)

perfect agricultural soil with optimal portions of sand, silt, clay (40%, 40%, 40%)

O - A -E - B - C - R

slow-acting and long-lasting because the organic remains need time to be decomposed

in arid regions, water evaporates leaving salts behind

at plate boundaries (divergent=spreading, mid ocean ridges) (convergent=trenches) (transform=sliding, San Andreas)

cultivation of single crop, usually in a large area

wheat, rice, and corn provide more than 1/2 of the calories in the food consumed by the world’s people

the amount of a chemical that kills 50% of the animals in a test population within 14 days of the initial dose

the maximum dose that has no measurable effect on a given population

97.5% seawater, 2.5% freshwater

any water-bearing layer in the ground; confined or artesian, unconfined or water table

land sinks as result of over pumping an aquifer

lowering of the water table around a pumping well

near the coast, over pumping of groundwater causes saltwater to move into the aquifer

• drop/trickle irrigation • industry = recycling • use gray water • repair leaks • low flow fixtures • reclaimed water for agriculture and golf courses