GEO 1111 Lecture Notes - Lecture 9: Apparent Polar Wander, Continental Crust, Paleoclimatology

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Lecture # 9: tectonics: which of these causes tectonic plate motion, slab push, slab pull, mantle convection - answer, centrifugal forces due to earths rotation, moons gravitational attraction (tidal pull) Two drivers: gravitational potential set up with ridge subduction zone setting, other half of answer is that earth is still warm thats why we have elevated ridges becuase of thermal buoyancy. It has to do with density, oceanic crust is much much more denser than continental therefore it will always subduct first, the key factor is the density of the material at hand. Divergence, as the mid-ocean ridges, molten material rises up from the mantle and spreads out, pushing the older rocks to both sides of the ridge. 8. why would a large earthquake be especially devastating for cities that are built on saturated sediments such as deltas or glacial sediments.