The Appalachian Mountains (Appalaches), often called the Appalachians, are a mountain range in eastern to northeastern North America. Here, the term "Appalachian" refers to several different regions associated with the mountain range, its surrounding hills and the dissected plateau region. The Appalachian range runs from the Island of Newfoundland southwestward to Central Alabama in the United States. (It crosses the 96-square mile archipelago of Saint Pierre and Miquelon, an overseas collectivity of France, meaning it is technically in three countries). The highest peak of the mountain range is Mount Mitchell in North Carolina at , which is also the highest point in the United States east of the Mississippi River.
The range is older than the other major mountain range in North America, the Rocky Mountains of the west. Some of the outcrops in the Appalachians contain rocks formed during the Precambrian era. The first of many mountain-building events that shaped the Appalachians occurred about 1 billion years ago when the interior portion of what is now North American was part of the supercontinent Rodinia. Many of the rocks and minerals that were formed during that event can currently be seen at the surface of the present Appalachian range. The mountains once reached elevations similar to those of the Alps and the Rockies before experiencing natural erosion.
The Appalachian range is a barrier to east–west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most highways and railroads running east–west. This barrier was extremely important in shaping the expansion of the United States in the colonial era.
Partly because the range runs through large portions of both the United States and Canada, and partly because the range was formed over numerous geologic time periods (one of which is sometimes termed the Appalachian orogeny), writing communities struggle to agree on an encyclopedic definition of the mountain range.
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Explores natural language generation, focusing on building systems that produce coherent text for human consumption using various decoding methods and evaluation metrics.
The Mississippian (ˌmɪsᵻˈsɪpi.ən , also known as Lower Carboniferous or Early Carboniferous) is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous period lasting from roughly 358.9 to 323.2 million years ago. As with most other geochronologic units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years.
West Virginia is a state in the Southern United States. It is bordered by Pennsylvania to the north and east, Maryland to the east and northeast, Virginia to the southeast, Kentucky to the southwest, and Ohio to the northwest. West Virginia is the 10th-smallest state by area and ranks as the 12th-least populous state, with a population of 1,793,716 residents. The capital and largest city is Charleston which has a population of 49,055. West Virginia was admitted to the Union on June 20, 1863, and was a key border state during the American Civil War.
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America and consisting of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations.
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