what happens when two continental plates meet at a convergent boundary according to plate tectonics?; how can mountain formation be described according to the theory of plate tectonics?; according to the theory of continental drift, what is actually moving the continents?; each year, tectonic plates move a few; at which type of boundary do lithospheric plates collide; plate tectonic theory; a region where the phenomenon described in question 3 occurs often is called a(n); plates move together or apart at trenches?