Science Terms

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Acid rain

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Acid deposition from rain combining with sulfur dioxide and nitrogen oxides, resulting in rain with a pH of 4.0.

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Aerobic

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Refers to an environment where oxygen (O₂) is readily available.

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Age-structure diagram

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A diagram showing the proportions of individuals in various age classes of a population.

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Agroforestry

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The cultivation of trees in plantations using relatively intensive management practices.

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Algal bloom

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An event of high phytoplankton biomass.

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Ammonification

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The oxidation of organically bound nitrogen of dead biomass into ammonium (NH₄⁺).

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Anaerobic

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Refers to an environment with no free oxygen (O₂).

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Anthropogenic

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Occurring as a result of human influence.

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Aquifer

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Groundwater resources in a defined area.

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Artificial selection

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The deliberate breeding of species to enhance desirable traits.