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.
Perched aquifer: Localized zone of saturation above the main water table created by a laterally limited layer of underlying impermeable material. Permeable/Permeability: Capable of transmitting water (porous rock, sediment, or soil); the rate at which water moves through rocks or soil.Permeable layer: A layer of porous material (rock or unconsolidated sediment); in an aquifer, the layer through which water freely passes as it moves through the subsurface.Pore space: Openings between geologic material found underground.Also referred to as void space or interstices.erched aquifer: Localized zone of saturation above the main water table created by a laterally limited layer of underlying impermeable material. Permeable/Permeability: Capable of transmitting water (porous rock, sediment, or soil); the rate at which water moves through rocks or soil.