Most people think of deserts as dry, flat areas with little vegetation and little or no rainfall, but this is hardly true. Many deserts have varied geographical formations ranging from soft, Rolling hills to stark, jagged cliffs, and most deserts have a parmanenet source of water. Although deserts do not receive a high amount of rainfall-to be classified as a desert, an area must get less than 25centimeters of rainfall per year-there are many plants that thrive on only small amounts of water and deserts are often full of such plant life.