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PWA Chapter 2
Cycles of Matter
16
Biology
11th Grade
03/17/2009

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Term
Acid Deposition
Definition
process by which sulfur and nitrogen emissions undergo chemical change in the atmosphere and are deposited in the environment as dry particles and gases, aor as wet acid precipitation, including rain, snow, and fog (2.2)
Term
Adhesion
Definition
molecular attraction between two substances or bodies; for example, the attraction between water and the inner surface of a glass tube (2.1)
Term
Algal Bloom
Definition
rapid overgrowth of algae in a body of water, usually resulting from high concentrations of nitrate and/or phosphate; can result in deoxygenation of water when algae die, causing death of aquatic plants and animals (2.2)
Term
Ammonification
Definition
production of ammonia or ammonium products via break down of organic matter by decomposers (2.2)
Term
Biogeochemical Cycle
Definition
the cyclical route taken by water and other chemical nutrients through all biotic and abiotic components of the biosphere (2.1)
Term
Denitrification
Definition
conversion of nitrate or nitrite to nitrogen gas by bacteria in soil (2.2)
Term
Evapotranspiration
Definition
combined evaporation and transpiration of plants from a terrestrial area (2.1)
Term
Heat Capacity
Definition
a maeasure of the amount of heat a substance can absorb or release for a given change in temperature (2.1)
Term

Hydrogen bond

Definition
weak bond that involves sharing an electron between a slightly positive hydrogen atom and a slightly negative atom, such as oxygen or nitrogen, typically in another molecule (2.1)
Term
Hydrologic cycle
Definition
cycle of evaporation and condensation of water that determines the circulation of water through the atmosphere and bioshpere; also known as the water cycle (2.1)
Term
Nitrogen Fixation
Definition
process whereby free atmospheric nitrogen (nitrogen gas) is converted, usually by bacteria, into compunds such as ammonium and nitrates that can be used by other organisms (2.2)
Term
Productivity
Definition

the rate at which organisms produce new biomass

 (2.3)

Term

Rapid Cycling

(of nutrients)

Definition
relatively quick movement of nutrients through nutrient reservoirs, such as organisms, soil, air, and water (2.2)
Term

Slow Cycling

(of nutrients)

Definition
long-term storage of nutrients in nutrient reservoirs, such as fossil fuel deposits; nutrients stored in these reservoirs are unavailable for long periods of time (2.2)
Term
Stromatolite
Definition
fossilized sedimentary structure formed from ancient bacteria; iron bands in present in some stromalites provide evidence of oxygen formation in Earth's past (2.3)
Term
Polar
Definition
refers to a molecule with uneven charge distribution (2.1)
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