yes, no, maybe, depends on where you are at.
No, separating sand from water is a physical process as the chemical identities of the sand and water remain the same.
A simple filter would be suitable for separating sand and water. An alternative would be to evaporate the water, leaving the sand behind.
it makes the sand moist
You get a mixture of salt and sand. Nothing more happens.
In general, water and sand do not have a chemical relationship. Something might happen if the sand grains are partially composed of a mineral that is water soluble. In that case, water will dissolve water soluble material in sand. But that is a physicalactivity and not a chemical one. Water and sand do not react chemically.
their is not water under the sand on a beach. If there was the beach would collapse.
This is most likely due to gravity. As water travels over the sand from a wave or swift tide, water begins to drain down through the drier sand on the shore. Gravity pulls the water downward under the top layer of sand.
yes under water
yes, no, maybe, depends on where you are at.
No! Because the currents under the water, down that deep, does not arrouse the sand and the water is not then moved
sand is put under pressure, water seeps in with other minerals and the minerals crystalize
sand cools of faster because the sand is less dense and it depends on witch sand beach sand will cool of faster because it is mostly water under it so it will cool of faster
I think they sleep on the sand under water.
Sand can be watered by sea waves; water being evaporated under solar heat, salt remain in sand.
they might live under a rock but they live under the sand during the winter
It sounds like there is a broken water line under the sand. Perhaps from a sprinker system?
Pour water in some wall then get fire and hold click under the water.