Which of the following describes how scientists separate the physical layers of the Earth? Group of answer choices

A Based on how the layers interact with each other

B Based on the size of each layer

C Based on the color of each layer

D Based on the atoms and molecules in each layer

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