EESA06H3 Lecture Notes - Lecture 2: Seafloor Spreading, Himalayas, Subduction
Document Summary
German man named wegener, but nobody believed him because he didn"t have a mechanism. Geologists used the term laurentia to refer to na in ancient past. Also showed fossil remains of same species in different continents. Slide 38: ice sheets are the normal for toronto. Slide 39: ice sheets of same age were in different parts of earth. Iceland"s mid ocean ridge can be walked on because it"s not as deep as other ocean floor. Submarines were made and sent them down. They"re active we just don"t see them. Hot water in mid ocean ridges scavenge minerals from rocks, even though they"re low in amounts. These mid ocean ridges pushed together and upward when they collided with other continents. Slide 47: deep ocean earthquakes show us where subduction zones are. Canada is in a mid plate position. Himalayas are from indo-australian and eurasian plates being shoved together. Magnetic field is keeping the world together and protecting us from the sun.
