How did muslims play an important role in the development of africa?

Gold is not now being extracted from seawater. why not? a. it would be too disruptive to marine life to develop any marine mineral resources b. there is no gold in seawater c. we don't know how to extract minerals from seawater d. it would be too costly and difficult to separate the small amount of gold from the very large amounts of halite and other minerals

The european union was formally established in

Alow-pressure belt means the air is cold and dry warm and rising cold and sinking warm and moist