A) What is a cone of depression, b) where is it found, and c) what causes it?

When groundwater is squeezed out from a well, a depression cone appears in an aquifer.

Explanation:

When groundwater is squeezed out from a well, a depression cone appears in an aquifer. This is an significant breakdown of water concentrations in an unconfined aquifer (water table). The depression cone is actually a decline in the pressure head around the well poured in restricted aquifers. Due to intense pumping in the region where the water table is situated, a cone of depression results in a big depressed region.