How is a loess that exists in a wind shaped landscape, formed?

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 layers of earth are based on what two sets of characteristics?

Giving an address, such as "1000 elysian park avenue, los angeles, .ca, its an example of describing the