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A hardiness zone is a geographic area defined as having a certain average annual minimum temperature, a factor relevant to the survival of many plants. In some systems other statistics are included in the calculations. The original and most widely used system, developed by the United States Department of Agriculture (USDA) as a rough guide for ...
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In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. [1] The system dates to Nevin Fenneman 's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4]
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the 5 inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.
The US has the 2nd largest Exclusive Economic Zone of 11,351,000 km 2 (4,383,000 sq mi). By total area ( water as well as land), the United States is either slightly larger or smaller than the People's Republic of China, making it the world's third or fourth-largest country.
A bioregion is a part of the earth's surface whose rough boundaries are determined by natural and human dictates, distinguishable from other areas by attributes of flora, fauna, water, climate, soils and land-forms, and human settlements and cultures those attributes give rise to.
The U.S. foreign-trade zones program was created by the Foreign-Trade Zones Act of 1934. The Foreign-Trade Zones Act was one of two key pieces of legislation passed in 1934 in an attempt to mitigate some of the destructive effects of the Smoot-Hawley Tariffs, which had been imposed in 1930. The Foreign-Trade Zones Act was created to "expedite ...