Scienists determined that PLATE TECTONICS form and shape land masses here on earth.
The movements of these plates cause earthquakes, as well as create volcanoes and form mountains.
There are three types of known plate tectonic boundaries. These are 1) convergent boundary (when two plates come together), 2) divergent boundary (when two plates move away from each other), and 3) transform plate boundary (when two plates slides past each other).