1. Which best describes the plate tectonics theory?
a. Earth's surface is broken down into several plates
b. Earth is made up of crust, mantle, and core.
c. The continents were once joined together, forming a supercontinent.
d. Earth has oceans, the continental crust, and the atmosphere.

2. Which of the crustal plate movements is likely to cause volcanic activity?
a. convergent plate movement
b. divergent plate movement
c. transform plate movement
d. conduction plate movement

3. When does a volcanic eruption occur?
a. two plates slide past each other
b. pressure builds up and forces magma up the vent
c. rocks are broken down into pieces or particles
d. there is a vertical displacement of seawater