what conditions will produce rocks with crystals? (site 2)

Answer

Brief Explanations:

Rocks with crystals are formed when molten rock (magma or lava) cools slowly. Slow - cooling allows atoms to arrange themselves into an ordered, crystalline structure. In addition, having a large supply of the chemical elements needed to form the crystals and a stable environment during cooling also contribute.

Answer:

Slow cooling of molten rock, availability of necessary chemical elements, and a stable cooling environment.