A cliff is a steep rock face, especially at the edge of the sea. It is very very steep and rocky. It looks like you cut a piece of land in half and water came at the end. It's formed by earth movements. A famous cliff is the White Cliffs Of Dover
A plateau is a large, flat area of land that is higher than the surrounding land.it looks like a very wide and low hill. It is made by lava. A well known plateau is the Tidean plateau.
A pass is a area between two mountains or a mountain and water. A pass looks like a road In between mountains or hills. A famous pass is the Dorah pass