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Ecology

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The study of interactions between organisms and their environment.

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Carbon cycle

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The process by which carbon is exchanged between the atmosphere, land, water, and organisms.

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Combustion

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The process of burning something, which releases carbon dioxide into the atmosphere.

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Nitrogen cycle

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The process by which nitrogen is converted between its various chemical forms, essential for life.

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N-fixing bacteria

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Bacteria that convert atmospheric nitrogen into a form usable by plants.

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Water cycle

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The continuous movement of water on, above, and below the surface of the Earth.

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Reservoirs

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Natural or artificial places where water is stored.

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Precipitation

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Any form of water, liquid or solid, falling from the sky.

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Transpiration

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The process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere.

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Limiting nutrient

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A nutrient that is in shortest supply and limits the growth of organisms.