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25 terms

Sience Final

STUDY
PLAY
Dissolved Oxygen
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.
Soil Texture
% composition of diff sized mineral particles (sand, silt, clay)
pebbles
bigger than pencil eraser
cobbles
bigger than a fist
boulders
bigger than a baskeball
sand
.05-mm, pencil point, biggest
silt
.002-.05, invisible, middle
clay
<.002, invisible, smallest
Ions
charged particles, skittles
Loam
40% sand, 40% silt, 20% clay, ideal soil
soil properties affected by soil texture
Aeration, Drainage(percolation), nutrient holding, water holding, workability
Soil acidity
how much acid is in the soil, affects plants and is affected by the plants, low pH increases leaching
Spodosols
coniferous soil, acidic evergreens, high E horizon
Alfisols
"our" soils, thick A horizon, leaf decomposition slowed by cold
Mollisols
"soft" grassland soild thick A
Ardisols
arid desert soild, thin A
Oxisols
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
Soil erosion
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
Soil Salinization
Improper irrigation ,leads to a bunch of salt building up and kills plants