Whats the difference between subduction and accretion

Based on this map, which statement about africa’s economic activity is most accurate? a) coastal countries are all members of opec b) economic development is more common with opec nations c) coastal countries have more access to productive resources d) economic development is more common above the sahara desert

Which area on the map would be most likely to have the most oil exploration in since the start of the 21st century? a) b) c) d) plz me

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