"Carbon is one of the most common elements on Earth. It is found in the tissues of living organisms, in the atmosphere, dissolved in ocean water, and locked up in limestone deposits that line the ocean floor. This diagram from NASA Earth Science Enterprise illustrates some of the most abundant stores of carbon and identifies some of the pathways in the carbon cycle along which carbon is transferred from one form to another."
http://www.teachersdomain.org/resources/tdc02/sci/ess/earthsys/ccycle/assets/tdc02_img_ccycle/tdc02_img_ccycle_l.jpg
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