According to the USGS, how much total copper was contained in world reserves as of 2018?(1 point)
Responses
790 millions tons
790 millions tons
300 million tons
300 million tons
45 million tons
45 million tons
5 million tons
Responses
790 millions tons
790 millions tons
300 million tons
300 million tons
45 million tons
45 million tons
5 million tons