Tectonics. Tectonics. It’s a word that you can really roll around in your mouth, like a tic-tac. Or a tim-tam. Or a tick-tock. Okay, maybe not that last one. Tec-ton-ics. Aside from its phonophiliac qualities the study of plate tectonics and the Earth’s interior is very interesting from a planetary science point of view, because the Earth has some internal qualities that are – as far as we know – unique amongst the discovered planets.