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A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. Troughs may be at the surface, or aloft, at ...
Within the trough is a slowly spreading north–south ridge which may be the result of an offset or gap of approximately 420 kilometres (260 mi) along the main fault trace. The Cayman spreading ridge shows a long-term opening rate of 11–12 mm/yr. [4] The eastern section of the trough has been named the Gonâve Microplate.
Ridge line extending to the left of the high pressure center (H). In meteorology a ridge or barometric ridge is an elongated area of relatively high atmospheric pressure compared to the surrounding environment, without being a closed circulation. [1] It is associated with an area of maximum anticyclonic curvature of wind flow.
To its north beyond the Cook fracture zone and west beyond the Three Kings Ridge is the South Fiji Basin. To its east beyond the Norfolk Ridge is the central part of the New Caledonia Trough. The northern Norfolk Basin contains three plateau regions with fairly uniform depths between 2.0 and 3.1 km (1.2 and 1.9 mi).
Image:US map - geographic.png, a geographical map. On Wikimedia Commons, a free online media resource: commons:Category:Maps of the United States, the category for all maps with subcategories. On Wikipedia itself: Category:Maps of the United States for maps of all varieties by subcategory.
The multiple fault lines, ridges, and basins, including the Virgin Islands Basin, Anegada Gap, and Sombrero Basin, that form part of the general trough stretching from the southeastern Puerto Rican mainland in the Caribbean Sea to the northeastern British Virgin Island of Anegada in the North Atlantic Ocean are often collectively grouped under the name of Anegada Passage or Trough.
The northern slope of the ridge is steeper than the southern slope. On the Aleutian side, the ridge is rimmed by a trough filled with a sedimentary sequence 9–10 km thick. [1] The average age of the Bowers Ridge is about 30 My (Late Oligocene). Rock from the upper part of the Bowers Ridge was determined to be of Miocene age.
USGS map colored by paleogeological areas and demarcating the sections of the U.S. physiographic regions: Laurentian Upland (area 1), Atlantic Plain (2-3), Appalachian Highlands (4-10), Interior Plains (11-13), Interior Highlands (14-15), Rocky Mountain System (16-19), Intermontane Plateaus (20-22), & Pacific Mountain System (23-25) The legend ...