Statement: Your question is well elaborate and has all needed data.
Answer:
Is there a picture?
Step-by-step explanation:
first most important effect is the erosion and the second most important effect is weathering.
1. correct
2. same as 1
3. 2/5, 2:5, .40, 40%
4. 3/5, 3:5, 0.60, 60%
Hope this helped☺☺
C should be your answer:))))