During a storm, sand is eroded from a beach at a rate of 2m3 per hour. What equation can be used to represent the volume of sand in cubic meters, c, in the beach? Let b represent the amount of sand in cubic meters at the beginning of the storm and h represent time in hours.

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