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Author Question: Earlier we discussed the concept of isostasy, where lower density rocks rise higher than higher ... (Read 83 times)

crobinson2013

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on: Feb 28, 2020

Question 1

The seafloor spreading process at ridges produces what type of faults?
◦ thrust fault
◦ strike-slip faults
◦ oblique-slip faults
◦ normal faults

Question 2

Earlier we discussed the concept of isostasy, where lower density rocks rise higher than higher density rocks. How is the variation of water depth at spreading centers (ridges) controlled by isostasy?
◦ It has nothing to do with isostasy; the areas are simply high because there are chains of active volcanoes along the ridge crest, producing the topography.
◦ Oceanic ridges are sites where the lithosphere is carried into the mantle on one side (aka subduction zones), and the volcanoes along these margins produce the ridge by buildup of lower density crust.
◦ The lithosphere cools as it moves away from the ridge axis by sea floor spreading, and cooler rocks are lower density, so the sea floor gets deeper as the lithosphere gets more dense.
◦ Volcanic rocks are lighter than other rocks, and so the abundant volcanic rocks at the ridges are lower density features that produce the seafloor topography.
Earth Science ¦ Tarbuck, Lutgens, Tasa ¦ 15th Edition
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Marked as best answer by crobinson2013 on Feb 28, 2020

sabina576

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Reply #1 on: Feb 28, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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crobinson2013

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Reply 2 on: Feb 28, 2020
Thanks for the timely response, appreciate it

rleezy04

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Reply 3 on: Yesterday
Excellent

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