Final answer:
Mineral formation is affected by cooling rate, with slower cooling leading to larger crystals and faster cooling leading to smaller ones. Crystals formed from magma are generally larger than those from lava. Minerals can form from heated underground solutions and from hot water solutions that can create channels in surrounding rock.
Step-by-step explanation:
Mineral formation is influenced by the cooling rate of molten rocks. The slower the cooling, the larger the crystals that form, while faster cooling leads to smaller crystals. Crystals formed from magma are generally larger than those formed from lava. Minerals can form from solutions when the solution is heated underground, and when the solution cools, elements and compounds can crystallize as minerals. Additionally, minerals formed from hot water solutions can create narrow channels in the surrounding rock.