Biogeochemical Cycles.ppt
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1、Biogeochemical Cycles,Defined: Movement of water through the Earth and its atmosphere 75% of the Earth is covered in water Less than 1% is drinkable. Most water is salty or frozen,Water Cycle,Evaporation: Heat changes water from a liquid to a gas Transpiration: Water evaporates from the leaves of pl
2、ants through openings called stomata,Water Cycle Pathway,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,Water vapor starts to coolcondensation occurs Condensation: process where water vapor turns into a liquid,Precipitation: Rain, snow, sleet, or hail falls when water drops become heavy Runoff: Water runs do
3、wn hill into rivers, lakes, streams, oceans Infiltration: Water soaks into the soil and collects as groundwater,.,.,.,.,.,.,.,.,.,.,.,Oxygen Cycle,Autotrophs: Release O2 into atmosphere by photosynthesis Most life needs O2 for cellular respiration Creates ATP (energy) for cells,O2,O2,Carbon (C) Cycl
4、e,Plants Absorb CO2 for photosynthesis Release glucose (C6H12O6) after photosynthesis,CO2,glucose,Animals Glucose passed up the food chain CO2 exhaled into atmosphere,glucose,glucose,CO2,CO2,Decomposers Obtain glucose by feeding on dead organisms Carbon released in their waste,glucose,glucose,glucos
5、e,Carbon,Human Contribution Release excess CO2 into atmosphere when fossil fuels (coal, oil, natural gas) are burned for energy Cycle is out of balance,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,CO2,Phosphorus (P) Cycle,Phosphorus needed to make ATP, DNA, lipids Problem: No phosphor
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