Environmental Science 12th Edition by William Cunningham,Mary Ann Cunningham

Exercise 23

Figures 14.3 and 14.4 show the margins of tectonic plates, or the sections of crust that make up the earth's surface. The movements-and collisions-of these plates are responsible for many of the geological resources and events we see around us. Because these movements are so important, the map is reproduced here. Examine it to answer the following questions:

Look at figure 14.3. Then explain why the double blue line through the Atlantic is a ridge. Describe the locations of a spreading, or rifting, zone in or near Africa, and one in or near North America.