5Carbon is the basis for all orgainic compounds and a major element involved in the fixation of energy by photosynthesis. In fact carbon is so closely tied to energy flow that the two are inseparable.
6Why is Photosynthesis important in the Carbon Cycle? PHOTOSYNTHESIS is one of the most important biological process on earth!Provides the oxygen we breatheConsumes much of the CO2Produces foodSupplies energy
7Why is Respiration important in the Carbon Cycle? Process of making energy of food available in the cell…Involves breaking downComplicated molecules into simple molecules(C6H12O6, sugars) (CO2, water)
8All organisms require energy The way living organisms obtain energy is through cell respirationCarbon dioxide is a product of respiration
9We are now familiar with how the atmosphere and vegetation exchange carbon. Plants absorb CO2 from the atmosphere during photosynthesis, also called primary production, and release CO2 back in to the atmosphere during respiration. Another major exchange of CO2 occurs between the oceans and the atmosphere. The dissolved CO2 in the oceans is used by marine plants in photosynthesis.
10Two other important processes are fossil fuel burning and changing land use. In fossil fuel burning, coal, oil, natural gas, and gasoline are consumed by industry, power plants, and automobiles. Changing land use is a broad term which encompasses a host of essentially human activities. They include agriculture, deforestation, and reforestation.
12Processes that release CO2 into the atmosphere are called carbon sources, while processes that absorb it are called carbon sinks. The amount of carbon in the atmosphere at any one time dependson the balance that exists between carbon sinks and carbon sources. Thissystem of sources and sinks operates all over the planet and is known asthe carbon cycle.
13The two scenes below represent two major sinks of the carbon cycle Terrestrial Ecosystem Marine Ecosystem
14Natural sources of atmospheric CO2 include volcanoes, fires, decomposition,respiration, digestion and, under certain conditions, oceans and fresh water bodies. The latter can release large amounts of dissolved CO2 when waters warm up or are disturbed by storms or tremors.Natural sinks for atmospheric CO2 include photosynthesis, oceans and freshwater bodies, fossil fuels and carbonate rocks, and the short and long carbon cycles.
15Intrusion into the Carbon Cycle The carbon cycle works as an input output system. The balance of this system is very important to maintaining the Global Carbon Cycle.