Scientists have measured the rate of growth of the Atlantic Ocean basin to be about 2 to 3 cm per year. This type of activity coincides with the formation of ridges on the ocean floor. What is the MOST likely cause of this activity?

Which feature results when plates of different densities converge and one plate slips under the other?

Oceanic crust is composed mainly of basalt. Continental crust is composed mainly of granite. Why does oceanic crust generally tend to subduct under continental crust when plates collide?

Gloria is studying earthquakes and volcanoes and where they occur. The dark lines in the map show tectonic plate boundaries. The numbers indicate locations where people could live.

If Gloria wanted to live where there were few earthquakes and volcanoes, which location should she choose?

At which type of margin does mountain building produce mountains composed entirely of preexisting crust material?