The largest is the Sahara Desert, a subtropical desert in northern Africa. It covers a surface area of about 3.5 million square miles. A list of more than twenty of the largest non-polar deserts can be found below.
9.Starting tomorrow, however, the days will gradually be getting longer; first by a few seconds, then speeding up for a while to over a minute longer each day. These changes are not lost on plants, wildlife and even humans. Changing day length has a profound impact on most living things.
10.ABIOTIC DATA. Deserts are be among the hottest and coldest places on Earth. Temperatures in hot deserts may reach 38°C (100°F) or more. At night the temperatures may fall to 0°C (32ºF) or less.
33 percent

11.

Most of the world's surface is covered in water, in the form of oceans. The remaining landmass of Earth amounts to approximately 29 percent of the surface. Of this remaining 29 percent, deserts of all types constitute an estimated 33 percent, or one-third, of the Earth's total landmass.
12.Re: Why is there no water in the desert? The soil in some deserts can also be very porous so moisture is not effectively trapped on the surface, which leads to less availability of the moisture to plants, and less evaporation and formation of new rain.
13.

Not only is it difficult for humans to survive in deserts - it is also hard for animals, plants and other forms of life to live. This, in turn, makes it even harder for human life to persist because there is always risk of running out of food.
14.Yes. In most deserts, there is some rain although it isfairly limited or very much exceeded by the effects of evaporation resulting in an arid designation. Most of the world's deserts will see 1–10 inches of precipitation a year, even the polar ones.
15.Desert, defined climatologically, is a place that receives less than 10 inches (250mm) of precipitation while at the same time the possible evaporation amounts to at least 10 times as much.
16.You can do sand surf anywhere there are sandy slopes. All you need is a sandboard and a lot of determination -- hauling yourself back up the sand dunes after each run can be agonizing. Many adventure companies rent out boards and teach the basics as part of desert safaris so you can get a feel for the sport.
17.Prevailing winds pushing “wet” air east into the Andes and then the resulting lack of moisture creates the desert. ... Another reason why certain latitudes can be dry is due to air cells. Hot air rises and rains. Then the air falls and cools at about 30 degrees latitude.
18.Living things have structural features and adaptations that help them to survive ... help survival such as nocturnal behaviour, silvery coloured leaves of dune plants ... features and adaptations of desert plants and animals help them to survive in the desert.
19.Human activities such as firewood gathering and the grazing of animals are also converting semiarid regions into deserts, a process known as desertification. Population growth and greater demand for land are serious obstacles in the effort to combat this problem.
20.Importance of Deserts

Deserts are vitally important to the planetary ecosystem. They cover approximately 1/3 of the dry land of our planet (3, p1). They are also amongst the most fragile and endangered biomes.

They provide us with about 30% of the total oxygen used by all species to sustain life. They also serve as a protective home to millions of unique species of plants and animals. The power and productivity of rainforests is so intense that they're often referred to as the “lungs of the earth.”
20.Temperature highs can reach 90 degrees Fahrenheit during the day.