Because it traps heat from the Sun and can't reflect Ultra Violet Rays back into space, because of Global Warming. Deserts Should be Planted with trees, just as depleted Forests Should be replanted with trees. Global Warming is caused by an imbalance of Chemicals in our Atmosphere. Too much Carbon Dioxide, and not enough Oxygen. Trees absorb Carbon Dioxide and emit Oxygen. Global Warming is a real danger to Mankind.
https://answers.yahoo.com/question/index?qid=20061023095340AApiniZ
In a single day in the Mojave, the climate (weather patterns for a particular region or habitat) is often very extreme, reaching hot temperatures of 50 ° C (120 ° F) and even hotter in the summer and often much cooler when the sun goes down (outside of the city-where there is no concrete or asphalt to hold the heat).
http://sciences.unlv.edu/desertsurvivors/Pages/mojave.htm
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https://answers.yahoo.com/question/index?qid=20061023095340AApiniZ
Rainfall is lowest on the Atacama Desert of Chile, where it averages less than 1.5 cm. Some years are even rainless. Inland Sahara also receives less than 1.5 cm a year. Rainfall in American deserts is generally higher — almost 28 cm a year.
http://cas.umt.edu/bssp/documents/cuturally%20congruent%20Units/ColleenClimateUnit%20080513.pdf
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https://answers.yahoo.com/question/index?qid=20061023095340AApiniZ
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https://answers.yahoo.com/question/index?qid=20061023095340AApiniZ
Semiarid desert The major deserts of this type include the sagebrush of Utah, Montana and the Great Basin. They also include the Nearctic realm (North America, Newfoundland, Greenland, Russia, Europe and northern Asia).
http://cas.umt.edu/bssp/documents/cuturally%20congruent%20Units/ColleenClimateUnit%20080513.pdf
The arctic is known for its cold, desert-like conditions. The growing season ranges from 50 to 60 days. The average winter temperature is -34° C (-30° F), but the average summer temperature is 3-12° C (37-54° F) which enables this biome to sustain life. Rainfall may vary in different regions of the arctic.
http://cas.umt.edu/bssp/documents/cuturally%20congruent%20Units/ColleenClimateUnit%20080513.pdf
The Mojave averages less than 12cm (5 inches) of precipitation (rain and snow) a year! Some places on Earth get more than that in some days! When it does rain, the water runs off of bajadas collects in low places like this desert playa (dry lake bed) or in washes called arroyos.
http://sciences.unlv.edu/desertsurvivors/Pages/mojave.htm
Seasons are divided into short, moist, and moderately warm summers and long, cold, and dry winters. The length of the growing season in boreal forests is 130 days. • Temperatures are very low. • Precipitation is primarily in the form of snow, 40-100 cm annually. • Soil is thin, nutrient-poor, and acidic. • Canopy permits low light penetration, and as a result, understory is limited. • Flora consist mostly of cold-tolerant evergreen conifers with needle-like leaves, such as pine, fir, and spruce.
http://cas.umt.edu/bssp/documents/cuturally%20congruent%20Units/ColleenClimateUnit%20080513.pdf
how does the precipitation affect the desert?
When it does rain, the water runs off of Bajadas collects in low places like this desert Playa means dry lake bed or in washes called arroyos.