Rate is related to?
a. volume
b. time
c. distance
d. percentage

Ans: B) Time

Rate is a measure of change of a particular property over a certain time period. The property could be concentration, volume, mass etc.

Mathematically, if x denotes a certain property and t denotes the time then:

Rate = Δx/Δt = x2-x1/t2-t1

x1 and x2 are the initial and final values of the measured property measured at time t1 and t2 respectively.

Thus, rate is related to time.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.