If the lenght of a rectangular field is 240 and the lenght is double its breadth find the

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

The layers of earth are based on what two sets of characteristics?

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