| Forms of dessert | |
Forms of dessertIn geography is defined as an area of the desert country in which the rainfall rarely exceeds 250 mm per year and the terrain is dor. The desert can as an ecosystem or a bioma be regarded. A desert is an ecosystem that receives little rainfall. You have a reputation for having little life, but that depends on the type of the desert; There is abundant life in many, the vegetation of the low humidity is adjusted and fauna hides usually during the day, to conserve moisture.The creation of social groups in deserts is complicated and requires a major adaptation to extreme conditions that prevail in them. The deserts are the most extensive area of the surface of the Earth: with more than 50 million square kilometres, almost a third of this occupy. Of this total, reply to, 53 percent to warm deserts and 47% to cold deserts. The processes of erosion are important factors in the formation of the desert landscape. Depending on the type and degree of erosion by wind and solar radiation is the cause, the deserts are different types of grounds: the sandy desert is that they mainly by sand, which are compiled by action of the winds up the dunes makes, the stony or Rocky desert é é n whose ground from rocks or pebbles is compiled (this type of deserts is often referred to with Arab woordhamada). The deserts may contain valuable mineral deposits in the arid environment, were formed or were exposed by erosion. On low-lying areas, salty Lakes forms. because of the dryness of the desert, they are ideal places for the preservation of fossils and human artifacts. Define FD ë rt also wilderness as a place to leave, not by people and not just by any living creature is lived in. According to this definition, also his deserts located in weather colder than the Arctic or tundra. The majority of classifications is a combination of the number of days of rain per year, the annual amount of rainfall, temperature, humidity and other factors. In 1953, Peveril Meigs divided desert areas of the Earth in three ë n category, according to the total of rainfall that they have received. Through this system, now widely accepted, it is extremely arid land which at least 12 consecutive months without rainfall, arid country has less than 250 mm annual rainfall and semi-arid country an average annual rainfall between 250 and 500 mm. The arid and extremely arid land is deserts and semi-arid country, which is covered with grasses, generally called steppes. However, the drought only no precise description of what a desert is. For example, receives the city of Phoenix, Arizona, less than 250 mm of rain per year, and is classified as desert, clear. However, received some icy areas of Alaska or Antarctica also less than 250 mm of rain per year, but the common perception is no desert (it is indeed cold deserts or snow deserts: them the higher life are very difficult), but (evapotranspiration and the possibility to find fresh water are significantly higher than in the classical understanding of what a desert is). A desert to determine more specifically, it is hot or cold, é é is one of the parameters that are used that the average annual precipitation: less than 500 mm\/year represent a semi-arid area where there is a lot of water tension (although if the temperatures) are low (under 15 can protect . Another ecological definition of desert is an area that to or less than 100 mm\/year of rainfall and without compensation from another natural source of fresh water is equal. The differences in criteria like to stay at the phenomenon called evapotranspiration. Evapotranspiration is the combination of water loss through atmospheric evaporation of water from the ground, together with the loss of water in the form of steam by the life processes of plants. ë le potential evapotranspiration is, therefore, the amount of water that evaporates in a given area. The city of Tucson, Arizona, receives about 300 annual mm of rain, however, about 2,500 mm of water can during the period of one year evaporate é é. In other words, it means that could almost 8 times more water evaporate in this area that normally falls. The rates of evapotranspiration for a portion of Alaska are considerably lower; then, still far receiving minimal precipitation, these areas of the basic definition of a desert: a place where the evaporation the total rainfall exceeds precipitation. That's why there are different forms of desert areas. The cold deserts can be treated with snow; these places do not receive much rain falls, and which remains as compact snow be frozen. desert, Rings cheap, meteo15jours.world-temperature.com, Hiking trails, http://weatherhiking.blog.co.uk | |