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photosynthesis carbon dioxide enters plants from the atmosphere respiration glucose is broken down into energy by cells and CO2 is released into the atmosphere decomposition when living things die, the carbon in their tissues breaks down and enters the ground human activity humans burn fossil fuels as a source of energy which releases massive amounts of carbon dioxide in the atmosphere co2 in atmosphere greenhouse gas nitrogen fixation bacteria change nitrogen gas into usable nitrogen gas denitrification bacteria turn nitrogen into unusable nitrogen gas n2 in atmosphere most abundant gas in atmosphere precipitation any form of h2o that falls from the sky, and lands on earth evaporation when water is converted from the liquid form to its vapor form and heads to the atmosphere runoff the movement of land water to the oceans seepage seeping; leaking transpiration the evaporation of water from plants condensation the change of water from its gaseous form to liquid water