Most work in mines. Central and west africa have some of the richest diamond, silver and iron mines in the world.
The answer is A.it forms on the earths surface
The picture is basically not necessary here, what the question is asking is : why do we have different time and different time zones?
Our time is divided into 24 hours, so you could ask: what happens every 24 hours? the answer is: the Earth rotates around its axis. So, the Earth motion responsible for this is its rotation around its axis.
