What killed the dinosaurs? Where is the billion-dollar gold deposit that will make me rich!? What these questions have in common is that we need to examine the rock-record beneath the surface. Similar to non-invasive medical imaging, where an MRI is used to generate images of your brain, in geophysics, we use gravity, seismic and electromagnetics, to make images of subsurface geology.
Presented at Nerd Night Vancouver: https://vancouver.nerdnite.com/2017/02/07/nerd-nite-v-25/