The rocky beach at Green Point used to be deep underneath the crust of the Earth and is one of the few places in the world you can stand on what was once the Earth’s mantle. While the Earth’s mantle is only 30 miles (45km) below your feet most everywhere else on Earth, it is over a thousand degrees and you would be smushed beyond any recognition if you tried to go there. However, here, on this beautiful beach in an obscure corner of Washington State, the plate tectonics has…
