EESA06H3 Lecture : EESA06 - lec 2.doc
Document Summary
On-line lecture student = hand in poster online. Plant tectonics = theory (recent, 20 years old) Formation of earth = 4 500 million years before present. Continental drift and pangea = 1912 (alfred wegener) Its the plates that the continents are imbedded that are actually moving. Continental drift = incorrect, continents move but don"t move independently of plates. Magnetic stripes on the ocean floor and wander paths for continents = 1965 (fred vine) Magnetism important rock property = age them, where they move. Mid-ocean ridges and hot spots = 1965 (tuzo wilson) (insert one more) Wegner = proposed that continents moved by plowing through the sea floor (continent drift) He named pangea (means all the lands) Pangea consists of laurasia (na & asia) and gondwana (southern continents) Pangea formed a c shape, has the tethya sea in the middle. Wegner couldn"t propose mechanisms for this movement.
