The graph below shows the amount of snowfall in a 6-hour period. Between which hours did the least amount of snow fall?

Answer:
hours 2 to 4
Step-by-step explanation:
At hour 2, the total amount was 6 inches. It remained at that value until hour 4, so the total amount of snowfall in those two hours was 6-6 = 0 inches.
The least amount of snow fall occurred between hours 2 and 4.