Extra Credit Deserts Approximately a third of the Earth’s land surface is made up of some kind of desert with very little rainfall and vegetation. Deserts are very dry and hot, but at some points experience a cold front. Deserts vary in several different ways. Some contain vast areas of sand, rocks or gravel with few plants. Severe winds blow in and out of the deserts transporting valuable mineral deposits, thus leaving behind preserved …showed first 75 words of 729 total…

…showed last 75 words of 729 total…to 100 kilometers long. A wind that periodically changes direction creates a reversing dune. Deserts range in temperature, soil content, precipitation and weather patterns. There are so many different types of deserts that it is hard to classify them easily. Not only are deserts limited to the Earth, but also they appear on mars and parts of other planets. There is some much information that has been found, yet so much more to discover. ------------------------------------------------------------------------ **Bibliography**