Question 13 of 20 Desalination is expensive because it requires
O A. licensing
O B. copper
O C. electricity
O D. extreme pressure

Geologists use  seismic waves to  locate an earthquake's epicenter.. 

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years

The answer is d. none  hope this .

I'm going to say it's 5-6 million