Organic gardening is a form of gardening that uses substantial diversity in pest control to reduce the use of pesticides and tries to provide as much fertility with local sources of nutrients rather ... > more
Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke ... > more
Phytoplankton refers to the autotrophic component of the plankton that drifts in the water column. Most phytoplankton are too small to be individually seen with the unaided eye. Phytoplankton, like ... > more
Sewage treatment is the process that removes the majority of the contaminants from waste-water or sewage and produces both a liquid effluent suitable for disposal to the natural environment and a ... > more
Environmental pollution is the release of environmental contaminants, generally resulting from human activity. Carbon monoxide, sulfur dioxide and nitrogen oxides produced by industry and motor ... > more
Sequence stratigraphy is a relatively new branch of geology that attempts to link prehistoric sea-level changes to sedimentary deposits.
The 'sequence' part of the name refers to cyclic sedimentary ... > more
Old growth forest, sometimes called late seral forest or ancient forest or primary forest is an area of forest that has attained great age and exhibits unique biological features. Old growth forests ... > more