Why is this part of a theory called 'continental drift'?

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers?

Based on current rates the earths human population is expected to grow how much by 2050

What causes the drought cycles in africa? a. the jet stream b. mount kilimanjaro c. monsoon climate zones d. quickly evaporating rainwater