mountain
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Mountains are created when two continental plates collide and no subduction takes place, resulting in the land at the collision zone being squeezed together and thrust upwards.
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Compassberg Mountains in South Africa. Many geological processes are at work here, particularly freeze-thaw action in which rocks are broken apart by the expansion of frozen water and repeated heating and cooling.
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A mountain landscape near Compassberg, South Africa.
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Pen y Fan, one of the major peaks or beacons that give the South Wales National Park its name, the Brecon Beacons. The mountain rises to a height of 886 m/2,907 ft above sea level and towers over Neuadd reservoir. It is a popular challenge for climbers from all over the UK.
Natural upward projection of the Earth's surface, higher and steeper than a hill. Mountains are at least 330 m/1,000 ft above the surrounding topography. The existing rock below a high mountain may be subjected to high temperatures and pressures, causing metamorphism. Plutonic activity also can accompany mountain building.
Mountain
| Province of northern Luzon Island in the Philippines; area 2,098 sq km/810 sq mi; population (1995) 131,000. The capital is Bontoc. The terrain is rugged, mountainous, and heavily forested. Rice, corn, and root crops are grown. |
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