The convection currents responsible for the shifting surface of Earth occur in what layer of our planet?

What is the name of this mountain range found in northern africa?

How does sociology account for the cause of drug and alcohol addiction?

Atraffic cop has pulled over a speeder, only to discover that he has stopped a close friend. the police officer is torn, because his professional obligations demand that he punish the speeder, but his personal obligations suggest that he should give a friend a break. what is this called?