I need a hypothesis for, How are crystals formed? can someone help.?

Answer 1

"I believe that crystals are formed when water evaporates and leaves the minerals behind."

Answer 2

Crystals form as a result of a process called nucleation.

So pretend that you have a saturated super-solution of sugar in water. Now, crystals won't form unless something in that system changes. But you can make the entire container of sugar water solidify if you just drop in one crystal of sugar.

Why does this happen? Because the crystal of sugar you dropped in has a lower energy than the solution. Basically, the crystalline sugar has already formed, and in doing so, has a lower energy. The supersaturated sugar solution has a high energy - there is too much sugar dissolved in the solution and it's not energetically favorable. So, when you introduce a low-energy sugar crystal, all of the sugar molecules in the solution have a low-energy source to "grab onto."

It's like bubbles in boiling water... they start out small at the bottom of the pan and become large at the top of the pan. That's because the bubble acts as a low-energy nucleus that high-energy water molecules can grab onto, thus reducing their energy.

If you need further explanation, let me know.