Nearly half the world;s manganese comes from

Sea water evaporites are used in the production of

Phosphorite deposits are the remains of marine organisms in upwellings

Most phosphorite deposits are found on land because

Hydrothermal vents and marine mud are potential sources of

________________ is second only to gas and oil in terms of annual economic value

Renewable energy is found in

The most feasible renewable energy resource from the ocean is

The concern about fresh water is

To use sea water as fresh water, we must

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