| this question isnt very well typed.
below the crust(most outer most part) is the hard darker rocky layer
then after several kilometers below is the water table ,about some 15 to 20 kms app.
then there rocky pores filled wiht water molecules called the aquifer
it is a permiable layers that allows water to perculate along,and filters the water as well.that is why the pure water is gained from there.............but more solublized entities like ionic and hydrates salts may perculate too. giving rise to serios water pollution. | 
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