oxygen available in water that is " breathed" by fish and other animals, the oxygen is passed by the water going through the fishes gills. If the oxygen drops than the fish will die
sustainable water use
where the amount of water that is being used is sustainable and is available for future generations.
% composition of diff sized mineral particles (sand, silt, clay)
bigger than pencil eraser
bigger than a fist
bigger than a baskeball
.05-mm, pencil point, biggest
.002-.05, invisible, middle
<.002, invisible, smallest
charged particles, skittles
40% sand, 40% silt, 20% clay, ideal soil
soil properties affected by soil texture
Aeration, Drainage(percolation), nutrient holding, water holding, workability
how much acid is in the soil, affects plants and is affected by the plants, low pH increases leaching
coniferous soil, acidic evergreens, high E horizon
"our" soils, thick A horizon, leaf decomposition slowed by cold
"soft" grassland soild thick A
arid desert soild, thin A
oxidized tropical rain forest soils, leaching, no litter, thin A
Sustainable Soil Use
using soil smartly so that there will b the same amount in the future
wind or water removing soil
American Dust Bowl
overgrazing, drought and soil erosion
Nutrient mineral depletion
agricultural removal of plants that break cycle
Tropical rainforest depletion
tropical forest removal or large scale slash and burn
Degradation of African Sahel
Overgrazing from population, drought dust scatters across atlantic and bleaches=kills coral reefs
Improper irrigation ,leads to a bunch of salt building up and kills plants
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