GEOL 122 Lecture Notes - Lecture 2: Extrusive Rock, Lithification, Magnesium Carbonate
Document Summary
Transform plate boundaries: plates slide horizontally past each other, pacific plate and north american plate, no volcanoes are formed because there is no gap forming. Divergent plate boundaries: plates move apart and create new lithosphere due to gap o mantle flows upwards and cools in the gap, north american plate and eurasian plate is an example (known as mid atlantic ridge) o rifting. Splits lithosphere (occurs when hot mantle rises) makes a new divergent plate boundary by splitting a pre-existing one. Convergent plate boundaries: plates collide and one is pulled into the mantle and recycled o plates are destroyed at convergent plate. The lithosphere (the rigid, outermost shell consisting of the crust and upper mantle) is broken up into plates that glide on the over the mantle. Evidence for plate tectonics: africa and south america match up nicely, hinting that the continents were once stuck together and gradually drifted apart, same rocks were found on the coasts of africa and.
