Sea Floor Spreading Video

Have you noticed lately that your students just aren t listening when you try to teac.

Sea floor spreading video. This video goes over the process of sea floor spreading and the evidence that supports this theory. I didn t know it would come to this. Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor.

Once the basalt cools completely into solid rock the. Most basalt magmas contain abundant molten iron. A dynamic principle of geology was explained with harry hess discovery of sea floor spreading.

The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american. In 1912 when alfred wegener proposed that the continents had once been joined together and had split apart the biggest weakness in his hypothesis was the. This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century.

Their crystals are pulled into alignment by the earth s magnetic field just like a compass needle is pulled towards magnetic north.