I would have to go with Europe.
The mountains have emerged where the tectonic plates meet. The collision of the tectonic plates can disrupt the earth causing earthquakes as well as the growth of a mountain. These mountains take awhile to become the giants they are.
Answer: A) switch from crops to livestock.
Hope this helps, sorry if I got this wrong.
Answer: The Nile River Valley
Explanation:
Possibly because they were frighted hope i helped (:
