10. . Alfred Wegener provided convincing evidence that all of the continents wer
ID: 298891 • Letter: 1
Question
10. . Alfred Wegener provided convincing evidence that all of the continents were once joined together into a single land mass (which he called Pangaea), but he was not able to provide a plausible explanation for how continents move. Later, Harry Hess and Robert Dietz proposed that instead of continents plowing though the sea floor, new sea floor forms at mid-ocean ridges. Briefly discuss two lines of evidence verifying that sea floor spreading takes place at the mid-ocean ridge on the Atlantic Ocean sea floor. The answer is not just a two-item list, but also a brief explanation of how this evidence indicates that the sea floor is spreading. (Note: this question is not about whether continents were once joined together; it is about the evidence that sea floor is spreading at mid-ocean ridges. The question is also not about the role of ocean trenches. No introductory sentence is needed. (4 points
Explanation / Answer
answer ; the major evidence for the seafloor spreading is the magnetic stripes that are forming on the oceanic crust adjacent to mid oceanic ridges.
by studying the ocean floor it is found that these magnetic stripes are occuring on either side of the mid oceanic ridges with same extent on both sides. these magnetic stripes are evidences for the magnetic reversals,
another major evidence for seafloor spreading is the age of the oceanic crust, the crust near the mid oceanic rige is hot and young while the crust away from the ridge is cooler, and older
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