4. according to the principle of cross-cutting relationships, if an igneous intrusion cuts across a layer of schist, the igneous intrusion is than the schist. a. more dense than b. the same geologic age as c. older than d. younger than

the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.