Plate tectonics is the theory of moving plates on Earth's surface. The main interactions between plates tend to be at their boundaries. The three main boundary types are
a. divergent, congruent, and trans-American.
b. convergent, divergent, and transparent.
c. transform, divergent, and convergent. (Answer)
d. tangential, circumstantial, and problematical.
e. none of the above.