|Ian, Luijy, David and Alejandro 2º(B)GROUP
Dialogue of the video
Ian-The desert is defined as an arid ecosystem and also the land area in which rainfall rarely exceeds 250 mm per year of water. A desert is an ecosystem that received very little rainfall. They have the reputation of having little life on it, but that depends of the kind of desert. The establishment of social groups in the deserts is complicated and requires a significant adaption to the extreme conditions. The deserts are part of a land area, occupying almost one third of the Earth, with more than 50 million square kilometers. Of all these, 53% are hot desert, and cold deserts, the 47%.
Luijy-Through this system, now widely accepted, extremely arid lands are those with at least 12 consecutive months without rainfall, arid lands have less than 250 mm annual rainfall and semi-arid lands have an average annual rainfall between 250 and 500 millimeters. However, some icy regions like Antarctica also receive less than 250 mm of rain per year, but for the common perception is not desert.
Thus, different forms of deserts. Cold deserts can e covered with snow, these places do not get much rain, which falls remains frozen and packed snow. These areas are commonly called tundra, when there is a short season them with temperatures above zero degrees (Celsius) and some vegetation flourishes in the period, or polar regions, if the temperature remains below freezing point throughout the year, leaving virtually no soil life forms.
Ian-Most of the non-polar deserts are formed because they receive very little quantity of water. The water tends coal to moderate the effects of climate which is abundant. In some parts of the world´s deserts arise due to the existence of “barriers” to rain: when the masses of clouds discharge much of their water on the mountain areas that are beyond are dry because the air contains little moisture. Deserts are also classified by their geographical location and dominant weather pattern as trade wind, multitude, anti-rain barriers, coastal, monsoon, or polar.
David-Surprisingly there are many species of plants surviving in the wilderness. Most of them are succulents, meaning they can store water. Others have seeds which lie dormant until the rain awakens them. Never the less , these plants are the way to get water and protect from heat.
Alejandro-Desert animals have evolved behaviors to adapt to extreme temperatures. As desert tortoises admirable animals get their water from the plants they eat.
Other animals get their from their prey hunted such as the wonderful fennec, or desert fox, the animal is real impressive mind that can adapt to any changes easily. The animal perhaps the most representive of all the desert camel, an animal that can survive for days without drinking and it is an animal that people have long used for their strength and intelligence.