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help with science

subjects that need help for EOG

TermDefinition
nitrates comes from fertilizers,consitered nutrients, bad for H2O (makes more alge) disired to be lower than 2
temprature cooler is better 45 degrees F
dissolved oxygen should be high, higher than 4 ppm
pH measures activity or alkalinity
turbidity measures cloudiness of H2O ( high turbidity=cloudy, low turbidity= good)
Bio-indicators living things that indicate the quality of the H2O (leeches,worms,and mosquitos are bad indicators: dragonflys,fish,mayflys,and caddisflys are good indicators)
geologic time scale a timeline that organizes the events in Earth`s history Eon,Era,Period,Epoch in descending order
Lithosphere the crust of the Earth. it is broken into sections called plates
Law of superposition in undesturbed sedimentary rock layers, older layers of rock lie beneath younger rock layers
radioactive dating Radioactive Dating, the calculation of a substance's age by measurement of the radioactive material it contains or of the amount of natural atomic fission that has occurred in the substance
Created by: jcastl960
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