EESA06H3 Lecture 1: 1
Document Summary
Chapter 1: intro to physical geology and the environment. Superconinent cycles: superconinents are unstable & coninue to break apart and reform. Sea-loor spreading: progressive widening of the ocean basins. Basalt: igneous (volcanic) rock found inside oceanic plates. Subducion: when one plate moves under another - causes earthquakes or tsunamis. Outcrops: where you can see the rock formaions in the ield. Post-glacial rebound: ice pushes surface down, when it melts the surface goes back up. Andesite (andezit): what coninental crust is made of. 2. 12), they are very thin plates of rock: the oceanic crust is sinking. When rocks start to sink, they create an ocean basin illed with water: tsunamis can cause the land to move 30 metres to the let. Ater 700 km there are no earthquakes because the slab of rock is sot rather than britle. Convecion system: hot air/water rises, cools, then sinks back down.
