What is an ocean basin?

How is the deep ocean floor different from the shallow parts of the ocean floor near land?

What is the source of most of the salt in the ocean?

Which of these is NOT a threat to living ocean resources?

Which are the main producers in the ocean?

Which region of the sea is affected by changes in the tides?

Producers in the upper part of the ocean get nutrients from

How are estuaries different from lakes or the ocean?

Which of the following is the main reason why the ocean is salty?

All of the following determine specific ocean zones except:

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