"lagoon", a body of water that is surrounded by land

Tidal Flats

A tidal flat is created when water is over flowed a muddy land.

Coral  Reef

A reef is a large slab of rock near the shore, where corals grow from

Continental Shelf

A continental shelf is the distance of the land mass before it drops down to the abyss.

Continental Slope & Rise

The slope part of the shelf that dips down to the abyss. The rise is  when the slope touchs the floor. 

Abyssal Plain

The abyssal plain is the edge of the trench in the ocean. It is connected to the rise and it pushes up on the slope.