The answer is that it occurs when minerals absorb into water
and expand. Hydration is a term used to show that a substance contains water.
Hydration enthalpy, energy unconstrained from water reactions. Also it is known
compound produced by combining a substance chemically with water. Many minerals
and crystalline substances are hydrates.
Answer:
The crust is the thinnest layer and what we live on.
The mantle is the biggest layer
The outer core is the only liquid layer
The inner core is the hottest layer
Is this multiple choice? If so, can you show it so I can help?