Answer: MERIDIAN.
Explanation: Meridian can be defined as an imaginary great circle on the Earth's surface, passing through the geographic poles i.e from north to south. This in turn separates the sky into East and West. They connect the points of equal longitude, as measured in angular degrees east or west of the Prime Meridian.
I am scientist and i am going to collect data from a volcano today. I am most likely an Geologist.
geologist study about earth. therefore the person is most likely to study Volcano
The same thing humans used to do before technological advancements. African tribal people mostly consist of hunger gathers