Write 2 characterstics features of mountains
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They usually have steep, sloping sides and sharp or rounded ridges, and a high point, called a peak or summit. Most geologists classify a mountain as a landform that rises at least 1,000 feet (300 meters) or more above its surrounding area. A mountain range is a series or chain of mountains that are close together.
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Mountainous terrains have certain unifying characteristics. Such terrains have higher elevations than do surrounding areas. Moreover, high relief exists within mountain belts and ranges. Individual mountains, mountain ranges, and mountain belts that have been created by different tectonic processes, however, are often characterized by different features.Chains of active volcanoes, such as those occurring at island arcs, are commonly marked by individual high mountains separated by large expanses of low and gentle topography. In some chains, namely those associated with “hot spots” (see below), only the volcanoes at one end of the chain are active. Thus, those volcanoes stand high, but with increasing distance away from them erosion has reduced the sizes of volcanic structures to an increasing degree.The folding of layers of sedimentary rocks with thicknesses of hundreds of metres to a few kilometres often leaves long parallel ridges and valleys termed fold belts, as, for example, in the Valley and Ridge province of Pennsylvania in the eastern United States. The more resistant rocks form ridges, and the valleys are underlain by weaker ones. These fold belts commonly include segments where layers of older rocks have been thrust or pushed up and over younger rocks. Such segments are known as fold and thrust belts. Typically their topography is not as regular as where folding is the most important process, but it is usually dominated by parallel ridges of resistant rock divided by valleys of weaker rock, as in the eastern flank of the
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