As a part of my GSCE Geography revision of coastal processes, I produced these simple animations.

When a large notch is formed at the base of a cliff the cliff collapses and is taken out the sea by the tide.
Crack, cave, arch, stack, stump. It’s Geography to me.
This is the pebble being carried along the beach by the Longshore drift.

I hope they clarify some points for you if you are studying Geography at this level.