telstar.ote.cmu.edu/.../m3/s4/cycleOxygen.shtml
worldenergyblog.com/2009/09/carbon-cycle/
www.nicksnowden.net/.../nitrogen_cycle.htm
Carbon is a very complex molecule and a has a unique formula that allows carbon to form tetravalance and have many carbon bonds. Carbon has so many different uses and has many isotopes. It is mostly concentrated in living matter but also is found in the earth. Carbon is cycled through the enviroment by the processes of burning, respiration, and decay. Carbon has recently been taking the blame for the greenhouse effect and for global warming. Carbon dioxide is a green house gas and is one of the gases that increase the temperature of the planet. The burning of fossil fuels is also accountable though. Burning fossil fuels releases excess carbon into the enviroment. The carbon cycle is one of the main ones of all the systems, besides the oxygen cycle. Carbon has recently been taking the blame for the greenhouse effect and for global warming. Carbon dioxide is a green house gas and is one of the gases that increase the temperature of the planet. The burning of fossil fuels is also accountable though.Burning fossil fuels releases excess carbon into the enviroment. The carbon cycle is one of the main ones of all the systems, besides the oxygen cycle. The nitrogen cycle is very important also. It is an important nutrient cycle and produces amino acids, proteins, and nucleic acids. Nitrogen comes mostly from the atmosphere but in cycled through plants. The oxygen cycle is the cycle of oxygen through the air, living things, and the earths crust. All the cycles interact to make this world a livable place. The cycles are really complex and all are intertwined.
many, oct 2009, http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CarbonCycle.html
many, 2009, http://en.wikipedia.org/wiki/Oxygen_cycle
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