EESA06H3 Lecture 4: Lecture 4 Notes
Document Summary
The history of the continent is dictated by the history of oceans. If we look at the atlantic there is a spine that runs up the middle of the atlantic which is called the mid ocean ridge. They are under water volcanoes and they are active all the time. To accommodate the new volcano material, it pushes the north american and european plates apart. ____________________________________________________________________________________: introduction to mid ocean ridges: modern and. Faults: the mid ocean ridge is not strictly continuous, there are cracks called fractures, these fractures enable ocean floor spreading on the curved surface of the earth. Dikes or dykes are orange strikes on rocks (picture with his motorcycle: they are the result from hot magma intruding into older rocks along fractures, as this happens, the rocks are being extended and pushed apart. I t is made of olivine, green colour. Where the basaltic and gabbro magma comes off ridge.
