How would you separate sand and water

By decantation pursued by filtration  

As sand does not blend water. sand settles down like hastens. so you can empty it from water. what's more, water can be filtrated to get all the more perfect water.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).