Deserts constitute roughly _________ % of Earth's land surface. A. 5 B. 10 C. 15 D. 20 The main contributor to erosion in deserts is _________. A. heat B. wind C. ice related processes D. unthoughtful partiers E. heavy rainfall Where are Earth's subtropical deserts? A. Roughly -10 South to 10 North B. At the poles of the planet (80-90 degrees N & S) C. In the central regions of large continents D. Roughly 20-30 degrees N and S of the equator E. Just to the right of subtropical dinner Desertification refers to a process whereby __________. a) one or more layers of desert sand is deposited on top of another layer of sand b) when grasslands or some other ecology is converted into a desert c) a desert environment changes to another kind of environment d) a desert experiences increased erosion due to loss of plants e) when the salad slowly dries out, ferments, add sugar, and becomes a dessert What is primarily responsible for the formation of subtropical deserts? a. ocean currents b. interactions with mountain ranges c. strong southerly winds d. atmospheric convection cells e. dry land at specific latitudes Where on Earth are the most likely places to find a rain forest? a. In the latitude range from 30 degree south to 30 degree north. b. In the longitude range from 30 degree south to 30 degree north. c. Near the latitudes 45 degree north and 45 degree south d. Near the north and south pole. e. Near zero degrees latitude