The up and down movement of surface water.

A stream of water that flows like a river through the ocean.

The repeated rise or fall in the level of the ocean.

The area where the ocean and land meet.

The place where a freshwater river empties into a ocean.

A hard, rocky point of land left when softer rock is washed away by the sea

A pool of sea water found along a rocky shoreline.

A wall like structure made of rocks that sticks out into the ocean.

An underwater vehicle

A device that uses sound waves to determine water depth.

The process of removing salt from sea water.