When examining the geology of a region for potential useable aquifers, what characteristics or factors would you consider? Also, taking into account certain natural and human factors, which areas would you avoid?
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Regions which have a lot of gravel dumped on
them - and not so much volcanic ash is know as Aquifers. Gravel gets dumped because of
mountain building - say when the Rocky Mountains came up, they eroded off very
quickly and a huge area to the east was completely covered with
gravel. So old rivers, hills and valleys now lay under hundreds of feet
of gravel. Gravel holds water loosely and can be pump it out easily.
But where a lot of volcanic ash was dumped during periods of volcanic
activity, this makes for poor aquifers because the water can't move
through it very well.
ideal aquifer would be a relatively flat lying sandstone unit with a
lower clay stone unit to act as a sealing base. Deserts in tropical
zones often have good underground water as to sedimentary basins near
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