Archaeological evidence indicates that Paleolithic hunter-gatherer societies used which of the following technologies?

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

Based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 2 options: 500 m 600 m 400 m 750 m

In what three areas is the us leader?