Answer:
Outside
Explanation:
It is like bread so the crust of the earth is the outside
"To the west it is connected to the Da Hinggan Range by the Yilehuli Mountains, which run northwest-southeast for some 375 miles (600 km). ... Although the two ranges have similar names, the Xiao Hinggan is a completely different mountain system from the Da Hinggan (Greater Khingan)."
The answer to the question above is FIELDWORK. From the term itself, the work involves in the "field" or in the actual environment wherein the researcher him or herself immerses in the natural environment in order to accomplish a given work or task. This already involves participant observation since the researcher witnesses the actual behavior of the participants in the field.
