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20. Mid - ocean ridges (MORs) are elevated above the surrounding seafloor because a. rising ocean currents create a vacuum that pulls MORs up. b. the lithosphere is thickest at the MORS so they stand up taller. c. MOR rocks are hot and therefore are relatively less dense than the surrounding seafloor. d. MOR rocks are mafic, which are less dense than ultramafic ocean basin rock.

20. Mid - ocean ridges (MORs) are elevated above the surrounding seafloor because a. rising ocean currents create a vacuum that pulls MORs up. b. the lithosphere is thickest at the MORS so they stand up taller. c. MOR rocks are hot and therefore are relatively less dense than the surrounding seafloor. d. MOR rocks are mafic, which are less dense than ultramafic ocean basin rock.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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20. Mid-ocean ridges (MORs) are elevated above the surrounding seafloor because a. rising ocean currents create a vacuum that pulls MORs up. b. the lithosphere is thickest at the MORS so they stand up taller. c. MOR rocks are hot and therefore are relatively less dense than the surrounding seafloor. d. MOR rocks are mafic, which are less dense than ultramafic ocean basin rock.
Transcribed Image Text:20. Mid-ocean ridges (MORs) are elevated above the surrounding seafloor because a. rising ocean currents create a vacuum that pulls MORs up. b. the lithosphere is thickest at the MORS so they stand up taller. c. MOR rocks are hot and therefore are relatively less dense than the surrounding seafloor. d. MOR rocks are mafic, which are less dense than ultramafic ocean basin rock.
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