sea
ocean,lake and pond
The ocean, in a pond only the top layer will freeze!
they can be shallow or deep.
A pond because it is smaller than an ocean generally and isn't as salty.
the ocean is deep because that is the shape of the earth and although we are not sure how deep the ocean is we do know that there is life in the deep. the ocean has made itself deep but there is really no cause that is known.
Yes, pond is a common noun (If the pond had a name, it would proper).
If the pond is not deep, the fish can leave the pond. It is important to take good care of them or they will be tempted to leave.
pond
NO
A pond with sloped sides is necessary to allow for the frogs to get in and out of the pond easily. Using a flexible pond liner so that the pond slopes from shallow to deep is advisable.
The Pacific Ocean has the deepest point in the Challanger Deep.
Deep current is a movement of the ocean water. The ocean waters current is continuous.