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The top layer of the zone of saturation; undulates according to the surface topography and subsurface structure.

Unhealthy chemicals, microorganisms (like bacteria) or radiation, found in tap water.

Water saturation of soil that fills all air spaces and causes plant roots to die from lack of oxygen; a result of overirrigation.

A region or area over which water flows into a particular lake,
reservoir, stream, or river.

Land (marshes or swamps) saturated with water constantly or recurrently; conducive to wide biodiversity.

Ecosystems of several types in which rooted vegetation is surrounded by standing water during part of the year. See also swamp, marsh, bog, fen.

An area of undeveloped land affected primarily by the forces of nature; an area where humans are visitors who do not remain.

Legislation of 1964 recognizing that leaving land in its natural state may be the highest and best use of some areas.

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Power or energy derived from the wind (via windmills, sails, etc.).

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also known as WMO, specialized agency of the United Nations for
meteorology (weather and climate), operational hydrology, and related
geophysical sciences, headquartered in Geneva, Switzerland.