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Mountains: United States
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Fault-block mountains are formed by the movement of large crustal blocks along faults formed when tensional forces pull apart the crust (Figure 3). Tension is often the result of uplifting part of the crust; it can ... be produced by opposite-flowing convection cells in the mantle (see Figure 1). Fault-block mountains are present in the Great Basin of the southwestern United States. They may have been present in the western and central parts of West Virginia about 550 million years ago.
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The western edge of the Rockies, such as the Wasatch Range near Salt Lake City, Utah divides the Great Basin from other mountains further to the west. The Rockies do not extend into the Yukon or Alaska, or into central British Columbia. The Rocky Mountain System within the United States is a United States physiographic region.
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FRESNO, Calif., July 19 /PRNewswire/ -- Researchers at California State University, Fresno are puzzled over an ancient, man-made artifact discovered by forestry students on a recent field trip in the nearby Sierra Nevada mountains. The artifact in question is a steel knife that was apparently buried deep inside a Giant Sequoia tree and was found between growth rings in the tree indicating that it had been left there around 350-450 AD.
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