What West African ruler made a pilgrimage to Mecca? What were some of its effects?

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics? he proposed that plates carry parts of the seafloor. he theorized that pieces of earth move for a limited time. he suggested that the asthenosphere is broken into segments. he observed seafloor cracks similar to existing cracks in the continents.

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

This country is the world's leading producer of cork?