Coasts. Movement of water Wave Types Some waves build up beach material [constructive waves] whilst others drag sand and pebbles down the beach [destructive.
![Coasts. Movement of water Wave Types Some waves build up beach material [constructive waves] whilst others drag sand and pebbles down the beach [destructive.](https://static.fdocuments.us/doc/330x215/5697bfeb1a28abf838cb81cd/coasts-movement-of-water-wave-types-some-waves-build-up-beach-material-constructive.jpg)
