I think it's rather scary how thin the mantle is in many places. The oceanic crust is just above 10km deep, I'm sitting on something like 15km. That's.. not a l

I think it's rather scary how thin the mantle is in many places. The oceanic crust is just above 10km deep, I'm sitting on something like 15km. That's.. not a lot. I can cycle that in less than an hour.