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biogeochemical cycle

process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another

evaporation

the process by which water changes from liquid form to an atmospheric gas

transpiration

evaporation of water from a plant's leaves

nutrient

chemical substance that an organism requires to live

nitrogen fixation

process of converting nitrogen gas into ammonia

denitrification

conversion of nitrates into nitrogen gas

primary productivity

rate at which organic matter is created by producers in an ecosystem

limiting nutrient

single nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an ecosystem

algal bloom

an immediate increase in the amount of algae and other producers that results from a large input of a limiting nutrient

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