Hard and soft rock

There are lots of different kinds of rock, but all of them come under 2 different sorts, hard rock and soft rock.

Some of the soft rocks include certain types of limestone sandstone, chalk and clay. Most of these would probably be eroded by the sea and that would form a cove or a bay.

Hard rocks include pebbles, the other types of limestone and many other stones. A lot of these could be included in a headland.