Then we moved on to Metamorphic rocks. Knowing that these can be made through pressure or through heat we decided to see what would happen if we made sedimentary rock first and then heated it. We also did one without putting pressure on it. We had planned to do a third one and put pressure on it afterwards but after it melted we didn’t see much point in doing that. 🙂 But it was interesting since we did two of the three with double thickness aluminum foil and one with four times thickness. The four times thickness melted much slower, the pressured one melted even more slowly.
We melted some rock.
Our end result had me wanting to crush a bunch of ice and do it all over again, but I ran out of energy and decided it could wait until another day. 🙂