EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Continental crust is less dense than oceanic crust.
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Continental crust is made of granite.
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Continental crust is younger than oceanic crust.
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Continental crust is thicker than oceanic crust.
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Detailed explanation-1: -Statement 2 is incorrect. Continental crust is mainly made up of granite whereas oceanic crust is mainly made up of basalt.
Detailed explanation-2: -The continental crust is composed of granitic rocks, which have even more silicon and aluminum than the basaltic oceanic crust and are less dense than basalt.
Detailed explanation-3: -Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite.
Detailed explanation-4: -Minerals | Special Issue : Granite: The Signature Rock of the Earth’s Continental Crust.
Detailed explanation-5: -As long as subduction occurs, water is released and is delivered to the base of the crust, melting pre-existing basaltic rock to form granite magma. As it rises and cools, the granite magma crystallises to continental crust.