Which region has the greatest concentration of currently active volcanoes?
A. the coastal plain of western Africa
B. European Russia and Siberia
C. the area surrounding the Red Sea
D. the circum-Pacific area
Answer:D
Which region has the greatest concentration of currently active volcanoes?
A. the coastal plain of western Africa B. European Russia and Siberia C. the area surrounding the Red Sea D. the circum-Pacific area