Diagram of Earth's Nitrogen Cycle Poster

The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out via both biological and non-biological processes. Important processes in the nitrogen cycle include fixation, mineralisation, nitrification, and denitrification. The majority of Earth's atmosphere (approximately 78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of useable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in waste water have dramatically altered the global nitrogen cycle. Image reproduction rights can be found in the link near the bottom of this description. Sign up to Mr. Rebates for FREE and save 12% on any zazzle order in addition to a $5.00 sign up bonus All Rights Reserved; without: prejudice, recourse or notice (U.C.C. 1-308) Image Reproduction Rights: http://commons.wikimedia.org/wiki/File:Nitrogen_Cycle.svg nitrogen cycle "nitrogen cycle" chemical diagram chart "nitrogen diagram" "nitrogen cycle diagram" "nitrogen chart" "nitrogen cycle chart" chemistry "chemical chart" "chemical diagram" science "science diagram" "science chart" "earth science" biology transformation" "chemical change" fixation mineralisation nitrification denitrification atmosphere ecosystem ecology "school chart" "school diagram" "science class" school