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abiotic factor - nonliving physical or chemical part of an ecosystem; describes the nonliving part of the environment, including water, rocks, light, and temperature.abrasion - grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles driven by water, wind, or gravity.ammonia - poisonous gas made of nitrogen and hydrogen.

Archaean (plural-Archaea) - kingdom made up of unicellular prokaryotic cells that can survive in extreme environments.activation energy - least amount of energy required to start a particular chemical transport - movement of molecules from where they are less crowded to where they are more crowded; the process of using energy to move materials through a membrane.acid precipitation - rain, sleet, or snow that contains a high concentration of acids.acid rain - rain that has become more acidic than normal due to pollution.

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