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In which situation is it suitable to treat a seafloor rock as a clue of oceanic crust?

Answer and explanation

Correct answer: It is basaltic and mafic

Oceanic crust is the relatively thin crust beneath the oceans. It is formed mainly from dark, dense rocks rich in iron and magnesium, especially basalt. Because basalt has a mafic composition, it is a useful geological clue when identifying material associated with oceanic crust. The rock’s composition is more informative here than simply observing that it lies on the seafloor, since seafloor sediments or transported rocks may not represent the crust itself.

Choice A gives the expected combination: a basaltic and mafic rock. Granite is generally associated with continental crust and is lighter in composition, so B is not suitable. Liquid nickel is not a normal description of an exposed crustal rock, and atmospheric gas is not a rock at all. Thus, A is the only scientifically appropriate choice for recognizing a clue of oceanic crust.

Related tags

Oceanic CrustSeafloorBasaltic

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