The desert covers a fifth of the surface of the earth, and divides the desert into two types. Either the desert is hot and dry, of which there are many in South Asia, South and Central America, Ethiopia, and Australia, or a freezing cold desert which is found in places such as Antarctica and Greenland.
As deserts are not defined during high temperatures and the abundance of their sand dunes, as is the common belief, rather, the process of determining the desert is due to the lack of rain and snow, and the lack of living organisms that live in it, as the low amounts of rain reduce the amount of water falling on the desert floor, which It leads to dry land, and some may think that the polar continents with cold deserts contain a lot of water, but this water exists in the form of ice, and the low temperatures in this continent prevent the ice from turning into water, which makes the polar icy deserts of the most deserts. Absolutely dry.
The largest desert in the world
Snow covers all areas of the Antarctica desert, except for an estimated 2% of this desert that is not covered by ice, and this ice is approximately 1.6 km thick. As for the total area of the Antarctic desert, it is approximately 13.8 million square kilometers in total, and annual rainfall in it amounts to less than 51 mm in the interior regions, and humans cannot live in this desert, as the only people who are present in it are researchers only, In this desert there are certain types of moths, algae and tundra plants that have been able to cope with its cold weather, which abounds with strong wind storms, and which can turn into snowstorms, as it can reach speeds of about 320 km per hour.
The largest non-polar desert in the world
The Sahara Desert is the largest non-polar desert in the world. This desert is located in North Africa, with an area of approximately 9,064 million square kilometers, and is bordered by the Mediterranean Sea to the north, and extends all the way to central Africa, at a distance of approximately 1931 kilometers to the south.
The smallest desert in the world
The Atacama Desert is the smallest desert in the world and is located in Chile, with an area of approximately 105,200 square kilometers.  It is worth noting that there are no vegetation in this desert, as some areas in it did not have rain at all. Which made the river bed in it dry for tens of thousands of years, and the Atacama Desert has been a source of many great resources, such as sodium nitrate used as fertilizer, and copper, as for the current economic situation of the Atacama Desert, it is declining as this desert expanded towards the south to suitable lands Agriculture, resulting in the depletion of its ammunition.
Weather in the desert
The temperatures and weather conditions vary from one desert to another, in cold deserts the weather is very cold in the winter, temperatures may reach between -20.5 ° C to -79 ° C, and in hot deserts it is very hot and very dry in the season Summer, and it is warm in the rest of the year, and it is possible to rain on dry deserts in the winter, but the amounts of rain are very small, and it may evaporate before it reaches the surface of the earth due to the high evaporation rates in dry deserts.
Animals in the desert
There are many animals that make the desert their home, there are animals that live in the hot desert such as snakes, insects, lizards, kangaroo rat, and fox, and in order to protect the soul from predators such as coyotes and falcons, some of these animals build their home from the fallen thorns of cactus. In cold deserts, there may be animals such as deer, birds, mollusks, roosters, seals, penguins, and others. The number of animals that live in cold deserts is less than the number of animals that live in hot and dry deserts.