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.
Groundwater (or ground water) is the water present beneath Earth 's surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water.The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table.Groundwater is recharged from, and eventually flows to, the surface naturally; natural discharge often occurs at springs and seeps, and can form oases or wetlands.he upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone.