A scientist wanting to document a change in a river's flow pattern should observe a river over a period of
A B C D
days. weeks. months. years.
Question: A scientist wanting to document a change in a river's flow pattern should observe a river over a period of
(A) days.
(B) weeks.
(C) months.
(D) years.

Answer: (D) years.
Answer: (B) weeks.
Question: A scientist wanting to document a change in a river's flow pattern should observe a river over a period of
(A) days.
(B) weeks.
(C) months.
(D) years.
Answer: (D) years.