Describe the three kinds of plate boundaries.

There's three types of plate boundaries:
- Collision plate boundaries (where two or more plates of the same density collide )
- Adjacent plate boundaries (where two or more plates slide against each other)
- Subduction plate boundaries  (where one or more plates with lesser density are subducting below the the plate that has bigger density).

D.haka is the first answer and a.canberra is the second answer

Answer collision and mountain formation;