• Submited:2006-11-16 08:37:16
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• Category:Snow
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About Snow
Snow - photo wallpapers: Snow is a source of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by external pressure. Permanent snow covering is affected by factors such as the degree of slope on the land, amount of snowfall and the force and nature of the winds. As temperature decreases with altitude, high mountains – even those near the Equator – have permanent snow cover on their upper portions, around 5,300 m. Examples include Mount Kilimanjaro in Tanzania and the Tropical Andes in South America; however, the only snow actually to appear on the Equator line is at 4,690 m altitude on the southern slope of Volcán Cayambe in Ecuador. Conversely, many regions of the Arctic and Antarctic receive very little precipitation and therefore experience little snowfall despite the bitter cold (cold air, unlike warm air, cannot take away much water vapor from the sea). Here, the snow does not melt at sea level. In addition to the dry, snowless regions of the poles, there are some mountains and volcanoes in Bolivia, Chile and Argentina that are high (4,500 m-6,900 m) and cold, but the lack of precipitation near the hyperarid Atacama Desert prevents snow from accumulating into glaciers. Another example of these temperate unglaciated mountains is the Kunlun Mountains, Tibet and the Pamir Range to the north of the Himalayas in Central Asia. Here, just like the Andes, mountains in Central Asia can reach to 6,300 meters and be barren of snow and ice due to the rain shadow effect caused by the taller Himalaya Range.
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