The aquifer which will be most effective in purifying polluted ground water is AN AQUIFER COMPOSED MAINLY OF SAND. An aquifer refers to a zone of permeable rock strata which transmit ground water freely. An aquifer must be permeable and porous. Ground water can be extracted from an aquifer by using a water well.
<em><u>The epipelagic zone is home to most organisms because it is the sunlit upper layer of the ocean. it is also know as the photic or euphotic zone</u></em>
