One of the largest obstacles to deep ocean research is

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

What volcanoes form on a divergent plate margin