scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 1,519
Introduction Continental drift is the theory that the positions of the earths continents have moved considerable distances throughout geologic time A German meteorologist by the name of Alfred Wegener proposed the first comprehensive theory of continental drift in 1912 He based it on the way the continents fit together on the opposing Atlantic coasts as well as the paleontology correlation on both sides of the Atlantic The theory he proposed stated that 200 million years ago there was one large continent or supercontinent called Pangaea Pangaea split into two large landmasses called Laurasia and GondwanalandPlummer 460 During the Mesozoic era Laurasia and Gondwanaland broke apart in some areas and drifted further away from their previous positions In this process the Earths rotation caused horizontal alterations in the granite continents floating on the sea of the basaltic ocean floors The frictional drag along the leading edges of the drifting continents created mountains Wegeners theory met controversy until 1954 when British geophysicists seeking to explain the phenomenon of polar wandering revived it Plummer 460 Around the same time that geologists were again becoming interested in the idea of moving continents a geologist at Princeton University by the name of Harry Hess came up with the theory of sea floor spreading in 1962 Hesss theory states that the sea floor moves away from the mid-oceanic ridge as a result of mantle convection This theory clearly contrasted with Wegeners early theory of continental drift except for Wegener believed that the sea floor remained stationary while the continents moved through it In the late 1960s the theory of Plate Tectonics evolved from the two preexisting ideas of continental drift and sea floor spreadingPlummer 465 Geologists and biologists have traditionally thought of life as having adapted to changes in the environmental conditions over time but a new view of the earth has emerged from what is now called the Gaia theory Many scientists now look at the entire
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA