The interacting populations of plants, animals, and microorganisms occupying a certain area, and their relationship to the environment.
This category is also used for biosphere, clines, ecoclines, and ecotones.
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Digital map of surficial geology, wetlands, and deepwater habitats, Coeur d'Alene river valley, Idaho

Details of materials and geologic environments in an area where a long history of mining has enriched stream sediments in silver, lead, zinc, arsenic, antimony and mercury, copper, cadmium, manganese, and iron.