How do you think causeways improved life for the Aztecs?

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

Do larger countries receive more money in remittances than smaller countries

How can you use a maps legend to plan your travel