Simplify the following text for a Grade 2 native English-speaking person.
Original: Chalk is resistant to weathering and slumping compared to the clays with which it is usually associated , thus forming tall steep cliffs where chalk ridges meet the sea . Chalk hills , known as chalk downland , usually form where bands of chalk reach the surface at an angle , so forming a scarp slope .
Simplified: Blackboard chalk is not real chalk .