Please answer all questions below. (Do not skip and at least post answers. What
ID: 288606 • Letter: P
Question
Please answer all questions below. (Do not skip and at least post answers.
What does this illustrate? A)eocentric Model B) Heliocentric Model C) Core, mantle, crust Model D) Tectonic Model Plate Tectonics Chapter 2 Marshak A) Think about it questions 1) List evidence that Alfred Wegener used. 2) What were some additional lines of evidence that were used for plate tectonics (developed after Wegener died) 3) Mostly evidence of plate tectonics was geographic related. Today imaging is more important. Satellites, etc. Would these new techniques be more or less direct in proving plate tectonics. B) Questions that could be made in multiple choice or true or false 1) What theory did Alfred Wegener develop? 2) What was mostly hidden from us in plate tectonics? What hid it? (hint: WWll caused interest) 3) About what decade did plate tectonics theory become formulated. 4) From what location does seafloor spreading start? 5) As you move from spreading center, what thickens?Explanation / Answer
A1) Wegner in developing his theory of continental drift used the following evidence:
a. the fit of the continental boundaries especially between the eastern boundary of South America and the western boundary of Africa.
b. matching fossil record which was reported for landmass across the oceans.
c. the correlation between the geology and the geological structures across the oceans like the continuations of mountain belts.
d. the evidences of glaciations from the differnt continents indicative of a shared ancient climate.
A2. Some other eveidences that were added to develop the plate tectonic theory was
a. the sea floor spreading model given by Hess which provided a mechanism to drive the plates around.
b. the discovery of the mid oceanic ridge systems which idicated that new sea floor was being constructed and subsequently the discovery of the subduction zones where the old excess crust was being consumed.
c. the discovery of the magnetic anomolies pattern gave a way to understand the motoions of the plate.
d. the dicovery of Tuzo Wilson of a new type of fault, the transform fault explaining the large scale movements along the ridge.
A3. Yes the satellites and other imaging techniques would have been direct in proving plate tectonics as we could have mapped and imaged the while earths surface and undersood the bounaries fit better. Also with the help of the satellites we could have measuered the very slow motions of the plate.
B1. Alferd Wegner developed the “Theory of Continental Drift”.
B2. The mid oceanic ridges which was the places were thecrust was being produced was hidden from us. It was hidden under the vast oceans.
B3. The plate tectonic theory was formulated in the 1960’s.
B4. The sea floor spreading started from the mid oceanic ridges.
B5. As we move from the spreading center the lithosphere cools and the plate thickness increases.