Which underwater ecosystem is made of calcium carbonate structures?
Where does the salt in oceans come from?
Which ocean surrounds Antarctica at the South Pole?
Which is one quality of the entire open-ocean zone?
Which is one of the ecosystems found in intertidal zones?
Which factor affects the temperature of ocean water?
Which ocean borders Africa on the western coast?
Which is one feature of the ocean floor found in the open ocean?
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