To explain further, what stops lakes from simply seeping into the dirt, and thus vanishing? As a follow up question, what stops water from getting evaporated, and then the clouds move somewhere else and rain, thus depriving the lake of the water it lost?
In: Earth Science
On a side note:
Clay particles are like playing cards on a much smaller level. When they are first deposited, they can stack up like a house of cards; however, when enough weight is placed on top, they will flatten out. This arrangement of the clay particles will keep water from flowing through these layers.
On the other hand, sand particles act like little balls. The rounder the balls, the more void space between each sand grain. Imagine a swimming pool full of bowling balls. If you pulled the drain, there would be nothing preventing the water from draining out.
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