Interesting stuff. The entire central portion of Idaho is a batholith which is one big piece of rock that was formed out of granite at depth and then eventually floated to the surface because granite is lighter than the surrounding rocks. Whoever figured that one out has not tried to pick up any of the granite boulders that inhabit the soil everywhere I try to dig a hole on my property in north Idaho! But I digress. It is pretty likely that all of the subduction along the plate boundaries in the Pacific contributes material to the mantel in some way. Maybe Hobbits too. You know, I wonder if AOC is a Hobbit?
She's a bad habit, that's for sure.
Orc.
Not hobbit.