NAHIRPRINCESSA desert is an arid area of land where little precipitation and living conditions occurs therefore are hostile to the plant and animal life . The lack of vegetation exposes the surface of the earth without protection denudation processes . About a third of the world's land area is arid or semi-arid. This includes most of the polar regions, where little precipitation occurs and is sometimes called " cold deserts " . Deserts can be classified by the amount of precipitation that falls , the prevailing temperature , the causes of desertification or its geographical location.
Desert climates Deserts are distributed among different areas: Or semi-arid steppe zones: They have an average rainfall of 250-500 mm annually. Usually they located on the edges of deserts and cover about 15% of the Earth's land surface. Drylands: With annual rainfall of 25-250 mm, covering 16% of the earth's surface. Hyper-arid areas: They are so dry that sometimes does not rain for years. These cover 4% of the land surface. Its temperature is between 30 and 40 degrees Celsius during the day and at -10 to 0 degrees Celsius overnight.
Flora and fauna Deserts wildlife is scarce and varied. It includes reptiles such as snakes and lizards; insects such as beetles and ants of the genus Cataglyphis; arachnids, like scorpions; raptors, vultures, and mammals such as mice, foxes, jackals, camels and dromedaries. The flora of the desert climate is poor, low and dispersed. Leave uncovered large areas that are occupied by sand, pebbles or rocks. The steppes are low grasses and shrubs and isolated desert, prickly plants such as cacti and bushes. Only in the presence of water oasis allows abundant vegetation, among which include palm trees and some bushes. Hydrography The rainfall is very low and irregular, due to the continuing influence of tropical cyclone. In the semi-arid desert margins, between 150 and 750 mm per year, and the aggregates are more than seven months. In deserts, annual rainfall does not reach 150 mm, and all months are dry. Usually they fall into violent downpours and the waters disappear soon provide by evaporation or seepage in the basement. Deserts rivers (wadis) carry water only after rainfall; the rest of the time riverbeds remain dry. Only rarely flow into the sea, as its scarce water evaporate or get stuck in closed depressions
Desert climates
Deserts are distributed among different areas: Or semi-arid steppe zones: They have an average rainfall of 250-500 mm annually. Usually they located on the edges of deserts and cover about 15% of the Earth's land surface. Drylands: With annual rainfall of 25-250 mm, covering 16% of the earth's surface. Hyper-arid areas: They are so dry that sometimes does not rain for years. These cover 4% of the land surface. Its temperature is between 30 and 40 degrees Celsius during the day and at -10 to 0 degrees Celsius overnight.
Flora and fauna Deserts wildlife is scarce and varied. It includes reptiles such as snakes and lizards; insects such as beetles and ants of the genus Cataglyphis; arachnids, like scorpions; raptors, vultures, and mammals such as mice, foxes, jackals, camels and dromedaries. The flora of the desert climate is poor, low and dispersed. Leave uncovered large areas that are occupied by sand, pebbles or rocks. The steppes are low grasses and shrubs and isolated desert, prickly plants such as cacti and bushes. Only in the presence of water oasis allows abundant vegetation, among which include palm trees and some bushes. Hydrography The rainfall is very low and irregular, due to the continuing influence of tropical cyclone. In the semi-arid desert margins, between 150 and 750 mm per year, and the aggregates are more than seven months. In deserts, annual rainfall does not reach 150 mm, and all months are dry. Usually they fall into violent downpours and the waters disappear soon provide by evaporation or seepage in the basement. Deserts rivers (wadis) carry water only after rainfall; the rest of the time riverbeds remain dry. Only rarely flow into the sea, as its scarce water evaporate or get stuck in closed depressions