Atmospheric pressure is caused by the weight of the atmosphere pushing down on itself and on the surface below it.
Pressure is defined as the force acting on an object divided by the area upon witch the force is acting.
the sodium chloride will be a crystal
it will have a giant crystal lattice
it all depends on Region and how long they have been there some minerals crush faster then some others so some might only take a few thousand while others might take millions
For an adiabatic process Heat is not allowed to cross the boundary of the system.
So:
E.no heat flows into or out of the system
