Let me take a crack at it:
They poured out the water and oil slowly and as oil floats on water,
they
poured out separately.
> relative density, which is linked with gravity and capillary force
(making it hard for water and oil to mix) which is linked to pressure
and molecular bond.
They dissolved the salt in the mix by adding water
> disoluton?
and then passed it through a filter to separate the salt water from the
sand.
> filtering? and percolation (what happened when fluid goes through a
sieve made of distincts particules... think coffe making)
The fourth thing to do is to evaporate the water to separate it from the
salt.
> state change, evaporation, precipitation?
Regards, cyrille
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