The answer would be the 4th option. (Rainwater soaking into the ground). Soil erosion is commonly caused by rainwater soaking into the ground.
Answer:
For 8.) it is either b or c but most likely b
I dont really know for 7 tho sry
Explanation:
Well since a hundred board should go by 10's until you reach 100, start at 61 then go up 10 spaces and the answer is 71
Hope this helps
~Jordan~
100 years. Thus, (C) is the correct option.
