Discover the heat of the desert, its plant and animal life, and principles of evaporation and erosion. A detailed map is included that shows the locations of the world's deserts as well as a graph that shows largest deserts in the world.
Doctors help people stay healthy. When people get sick, doctors help them get well again. Today, doctors use many complex instruments to treat people. Long ago, doctors had few instruments and did not know as many ways to help people get well.