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rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
a broad, regional type of ecosystem characterized by distinctive climate and soil conditions and a distinctive kind of biological community adapted to those conditions.
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
The total (or near total) removal of trees from a given forested area. The opposite of selective cutting.
forest populated by cone-bearing evergreen trees; mostly found in northern latitudes
A biome with four seasons, plants shed leaves in the fall and grow new ones in the spring.
a form of oxygen that has three oxygen atoms in each molecule instead of two. protects us from dangerous ultraviolet radiation from the sun
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