Jackie Caplan-Auerbach ๐บ๐ฆ ๐ป
5 years
PKPPKP!! This is a P-wave that passes through Earth's mantle (where it's called P), through the outer core (K), back through the mantle (P), reflects off of the surface, returns through the mantle (P), core (K) and mantle again (P). PKPPKP. AND YOU CAN SEE IT!! So awesome.