What is the name of the imaginary line that divides the earth into the northern and the southern hemisphere?

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

How have ethnic groups shaped the population in central america and the caribbean? how has migration shaped the population in central america and the caribbean? how has small land areas shaped population in central america and the caribbean? how has a rapid population growth shaped the population in central america and the caribbean?