What is the name of the ancient supercontinent form 28 million years ago

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

In which horizon of soil profile is prevent material usually found

East asia is considered a less developed nation. true or false