Cracks in a rock from exposure to pressure are an example of

I believe it is an example of frost action. A frost action is a type of mechanical weathering-as water freezes it expands which causes an increase in pressure and a crack, joint or fracture as the ice expands. Repeated freezing and thawing of the water may lead to fragmentation of the rock or frost/ice wedging.

What is the question? if you were looking to design a method of separating something, you can separate this compound by putting both in water and allowing the water to dissolve the sugar. then pour it into another beaker and evaporate it then boom! salt and sugar : )