What is the difference between molten and melted.?

Although both of the previous answers are right in their own way, the big difference between the two is that one (molton) is the process of melting something while the other (melted) is the results of that process where something that was solid has been liquefied.

The term molten is pretty much obsolete except within the fields (like casting glass or wax or bronze or in clinical lab work) where the process is applied.

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Melting is a process that results in the change of a substance from a solid to a liquid. The internal energy of a solid substance is increased to a specific temperature (called the melting point) at which it changes to the liquid phase. An object that has melted completely is molten.

"Molten" is always an adjective. "Melted" can be a verb or an adjective. Also, "molten" is more often used to describe material that liquefies at a higher temperature than those described as "melted." That is an opinion/generality.

Melted butter.

What Is Molten

In melted, the more important quality is the fact that it is liquified. (I.E-in a recipe, melted chocolate, melted butter--they're not that hot, but they are liquid.)

Molten refers to something that is liquified at a significantly higher temperature, such as metal or rock.

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"Molten" is an adjective. "Melted" is a verb -- the past tense of "melt".