There are two types of crust - continental and oceanic - and three directions of plate movement - converging, diverging, and passive. This results in six plate boundary types: destructive (oceanic-continental convergence), destructive (oceanic-oceanic convergence), destructive (continental-continental collision), constructive (diverging at ocean ridges), constructive (continental rifting), and conservative (passive movement). Each boundary type creates different landforms and hazards due to the associated geological processes.