Items starting with H


The area where a plant or animal lives and grows under natural conditions.

Habitat Capability

The ability of a land area or plant community to support a given species of wildlife.

Habitat Diversity

A number of different types of wildlife habitat within a given area.

Habitat Diversity Index

A measure of improvement in habitat diversity.

Habitat Type

A way to classify land area . A habitat type can support certain climax vegetation both tree and undergrowth species. Habitat typing can indicate the biological potential of a site.

Hiding Area

Vegetation capable of hiding 90% of an adult elk or deer from human's view at a distance of 200 feet or less. Also known as Cover

Historical range of variability

The variability in composition, structure, and dynamics of ecosystems before EuroAmerican influence, including the variation of physical and biological conditions within an area due to climatic fluctuations and disturbances of wind, fire, and flooding.

Horizontal Diversity

The distribution and abundance of different plant and animal communities or different stages of plant succession across an area of land; the greater the numbers of communities in a given area, the higher the degree of horizontal diversity.

House Concurrent Resolution (H.Con.Res.)

A concurrent resolution is a legislative proposal that must be passed by the House and Senate but does not require the signature of the President and does not have the force of law. Concurrent resolutions are generally used to express the sentiment of Congress or to amend the internal rules of the House and Senate.

House Simple Resolution (H.Res.)

A simple resolution is a legislative proposal that does not require the approval of the other chamber or the signature of the President and does not have the force of law. Simple resolutions are used only to change the internal rules of one of the chambers of Congress or to express the sentiments of one of the houses.

Hydrologic Cycle

Also called the water cycle, this is the process of water evaporating condensing falling to the ground as precipitation and returning to the ocean as run-off.


The science dealing with the study of water on the surface of the land in the soil and underlying rocks and in the atmosphere.

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