18. Air Pollutants: Gases and particulate material added to the atmosphere that
can affect climate or harm people or other organisms.
19. Air Pollution: The act of pollution the air, or the condition of being polluted by
air pollutants.
20. Air shed: The geographic area that produces air pollutants likely to end up in a
waterway.
21. Albedo: The capacity of a surface to reflect light. higher albedo values refer to
greater reflectivity.
22. Allergen: A toxicant that over activates the immune system, causing an immune
response when one is not necessary.
23. Allopatric Speciation: Species formation due to the physical separation of
populations over some geographic distance.
24. Alloy: A substance created by fusing a metal with other metals or nonmetals.
25. Anaerobic: Occurring in an environment that has little or no oxygen.
26. Anthropocentrism: A human-centered view of our relationship with the envi-
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