When geologists want to study an active earthquake fault, they often rely on a trenching study. ... They brace the walls, if needed, to prevent cave-ins, then they climb down into the trench and carefully map its walls, looking for signs of past earthquakes and ground movement.
Q2. Indians and Africans were considered black. Some Americans were even considered black too.
In terms of land area : Brazil
Iran is the only country that I found that wasn’t Arab. Sorry...
Tunisia extends farthest north.
Hope this helps!
