Question 20 of 20 Civilizations developed along rivers about 10,000 years ago, during the
Revolution.
A. Cro-Magnon
B. Iron
C. Guns and Steel
D. Neolithic
Need some help don’t get it

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

How many time zone are there on earth

The oldest seafloor in the atlantic ocean is located closest to the edge of the continents. explain how this age can be used to figure out when north america first began to separate from europe