I THINK 0.01...i think meaning im not 100% sure but i hope this helps
Answer:
4500 years old
Explanation:
Line up 50 to the graph on the y axis and it gives a x value of 4500
The correct answer is letter B. increase deposition of sediments upstream. The negative effect of using too much water for the irrigation of crops is that it wash out sediments and these sediments are brought down the water streams.
I believe your answer would be A- Farmers and urban dwellers.
Hope this helps. Correct me if I'm wrong.