Essay On Plate Tectonics

1378 Words6 Pages
Millie Newton Miss Amiat 22 February 2018 Plate Tectonics definition of plate tectonics Plate tectonics is the study of the structure of the earths crust & mantle with reference to the theory that the earths lithosphere is divided into large rigid blocks that are floating on semi fluid rock and are thus able to interact with each other at their boundaries and to the associated theories of continental drift and sea floor spreading. There are a few handfuls of major plates and dozens of minor plates. Seven of the major plates are named for the continents, such as African, Antarctic, North American, Eurasian, Indo Australian , Pacific and South American. Plate Tectonics explains why earth quakes and volcanoes are concentrated on specific…show more content…
Wenger’s proposition was that the continents were slowly moving along with tectonic plates and that was why they shifted position on the earths surface, the evidence to support his theory was the same plant fossils and similar rock formations all found on different continents. Wenger believed that the continents had once formed to make one whole continent known as Pangea, which is Greek for ‘all the lands’. According to Wenger’s theory Pangea began to break up about 225-200 million years ago and eventually fragmented into the continents we know…show more content…
Paleomagnetic evidence is an even stronger piece of proof for fossil evidence, magnetic strata within the fossils record show how the land masses were oriented at different times during Earths history, by constructing detailed records of changes in land mass orientation, scientists can reconstruct paths of tectonic movement much further back in history than they can from the magnetic striping on the sea
Open Document