I think D, because it talks about prompting more people to migrate.
Answer:
1. distance above sea level.
2. Deep narrow valley with side steeps.
3. A line that separates the flow of a river
4. An area of land that is surround by higher land and may be drained by a river.
5. A narrow passage
6. The land deposited at the mouth of a river
7. The process by Which the soil is prepared and used to grow crops
Explanation:
Ok so the answer will be C
Dr luceros team used looters trenches rather than dig new ones because they wanted to protect the site from further damage. This is because to prevent further destructions from their activity.
