News Â· 10:18 p.m. Â· July 29, 2012. Celebrity Net Worth recently compiled a list of the 20 richest living rappers. At first we were sure that reading their list was going to make us feel very, very bad about the current state of our checking accounts, but no worries â each of these rappers is so wealthy that it's impossible to put into perspective.
Definition of aquifer for English Language Learners. : a layer of rock or sand that can absorb and hold water.
An aquifer is a geologic layer of permeable and porous rock such as sandstone or limestone and that provides the water source for the artesian well. The aquifer absorbs and stores water and in an artesian well the porous stone is sandwiched between a top and bottom layer of impermeable rock such as shale or clay.This causes positive pressure.n artesian well is simply a well that doesnât require a pump to bring water to the surface; this occurs when there is enough pressure in the aquifer. The pressure forces the water to the surface without any sort of assistance.