depths
a deep place in a body of water.
sunken
lying at the bottom of a body of water.
What is organism?
an individual living thing.
Coral
the calcareous or horny skeletal deposit produced by polyps
reef
A chain of rocks or coral or a ridge of sand at or near the surface of water.
Glance
to take a quick look at something
What is Ecosystem?
a community of organisms and its environment functioning as an ecological unit.
marine
of or relating to the sea
Porpoises
small gregarious toothed whales
What is wrecked?
A destroyed house or ship.