Complete the sentences about water sources on earth

Fill in the combination notes for the main idea shown

The standard deviation of a population is 3.2.what is the margin of error? enter your answer in the box.

What's a recharge area? a. the part of an aquifer where groundwater meets a lake or stream b. the part of an aquifer where surface water reaches the water table c. the part of an aquifer that's located between two aquicludes d. the part of an aquifer that's located at a lower elevation