It identifies the focus and method of the research project.
AND
it provides important scientific and medical data to the public.
Answer:
The rock cycle is a concept used to explain how the three basic rock types are related and how Earth processes, over geologic time, change a rock from one type into another. Plate tectonic activity, along with weathering and erosional processes, are responsible for the continued recycling of rocks.
HOPE THIS HELPS!
The Vietcong set up checkpoints around the nation, so that would've definitely been a literal and figurative roadblock to any refugees. Hope this helped.
I believe that your answer is America.
