run-off absorption decomposition Cycling of Matter transpiration The water cycle.
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Transcript of run-off absorption decomposition Cycling of Matter transpiration The water cycle.
run-offabsorption
decomposition
Cycling of Matter
transpiration
The water cycle
fossil fuels
The carbon cycle
CO2 + H2O C6H12O6 + O2
Photo
Cell Resp
Cycling of Matter
1. Producers convert CO2 into glucose to store the sun’s energy – photosynthesis.
• Plants change glucose into other organic carbon compounds. (proteins, fats, carbohydrates)
2. Consumers eat producers - carbon compounds are digested back to glucose.
• Cellular respiration is used to break down the glucose for energy, releasing CO2.
4 steps of the Carbon Cycle:
3. Decomposers break dead plants and animals down and release CO2 and other simple molecules.
• Some decaying matter builds up in the earth, where is becomes fossil fuels.
4. Fossil fuels (oil, coal, natural gas) are burned by humans for energy.
• This combustion of fossil fuels releases CO2 into the air.
Increases the amount of CO2 in atmosphere:· Forest fires· Volcanoes · Deforestation· Combustion of fossil fuels
Disturbing the Carbon Cycle:
Decreases the amount of CO2 in atmosphere:· Tree planting· Recycling· Use energy-efficient products· Ride a bicycle everywhere
Atmosphere (air) is 78% nitrogen gas (N2).Most living things CANNOT use it in this form.
1. Nitrogen FixationBacteria change N2 into compounds plants CAN use to make proteins – nitrate (NO3) and ammonia (NH3).
These bacteria are found in soil near the roots of plants called legumes – peas, beans, peanuts.
N2
NO3
NH3
Decomposers breakdown proteins into nitrate and ammonia to be used by NEW plants to grow.
2. Denitrification
Different bacteria convert nitrate and ammonia from plant and animal waste back into nitrogen gas.
When consumers eat, they convert plant protein into animal protein.
N2
NO3
NH3
N2
N2
Cycling of Matter
denitrification
N2
nitrogen fixation
N2
Nitrogen Cycle
NH3
NO3
NO3 NH3
legumes
Water containing excess NO3, NH3 have frequent algae problems (blooms) that produce dangerous toxins.
Ammonia and nitrates seep into the ground water.
Agriculture (farming) – (NO3,NH3) – pollutes water.· animal manure · excessive fertilizers on crops· ORGANIC FARMING
Disturbing the Nitrogen Cycle
Vehicle exhaust – (HNO3) – causes acid rain.
