Mid-Ocean Ridges (MORs),which Are the Sites of New Oceanic Crust

question 52

Multiple Choice

Mid-ocean ridges (MORs) ,which are the sites of new oceanic crust formation,are linear mountain chains that run along divergent plate boundaries.Why does a MOR sit up higher than the surrounding oceanic crust?

• A)Hot materials are less dense and shrink;thus,the new crust will sit higher than the surrounding crust.
• B)As the hot magma exits the MOR,it shoots up higher than the surrounding crust.
• C)Hot materials are less dense and expand;thus,the new crust will sit higher than the surrounding crust.
• D)Hot,geothermal waters cause the new crust to expand and sit higher than the surrounding crust.

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