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The term "United States," when used in the geographic sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including the District of Columbia not as a state), Alaska, Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, American Samoa, and minor outlying possessions. [1]
Shaded relief map of the United States, showing 10 geological provinces. The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of ...
Shaded relief map of the United States, showing 10 geological provinces The richly textured landscape of the United States is a product of the dueling forces of plate tectonics, weathering and erosion. Over the 4.5 billion-year history of the Earth, tectonic upheavals and colliding plates have raised great mountain ranges while the forces of ...
The four national parks and protected areas spanning the border between the United States and Canada contain the world's largest non-polar ice field and numerous large glaciers. The area, shaped by glacial and continuous tectonic activity, comprises different types of habitats, from high mountains above 16,000 ft (5,000 m) to ocean, coastal ...
The United States has 63 national parks, which are congressionally designated protected areas operated by the National Park Service, an agency of the Department of the Interior. [1] National parks are designated for their natural beauty, unique geological features, diverse ecosystems, and recreational opportunities, typically "because of some ...
As of 2007, according to the United Nations Environment Programme, the U.S. had a total of 6,770 terrestrial nationally designated (federal) protected areas. Federal level protected areas are managed by a variety of agencies, most of which are a part of the National Park Service, a bureau of the United States Department of the Interior. They ...
The legal and policy landscape surrounding diversity, equity and inclusion efforts in the United States is changing. The Supreme Court of the United States has recently made decisions signaling a ...
The oldest surviving botanical garden in the United States is Bartram's Garden in Pennsylvania. [1] [2] This list is intended to include all significant botanical gardens and arboretums in the United States. [3] [4] [5] The total number of botanical gardens recorded in the United States depends on the criteria used, and is in the range from 296 ...