New Worlds: Plate Tectonics

(Forgot to cross-post this last week. Does anybody know of a replacement for the Livejournal Crossposter WP plugin? That one stopped working for Dreamwidth a while ago, which is why I'm having to do all of this by hand.)

This week (or rather, last week now) on New Worlds: plate tectonics! And also mountains, volcanoes, earthquakes, and other things that go along with the fact that our world is a big ball of rock plates floating on a sea of molten lava. Comment over there!