The older oceanic crust is denser than the younger oceanic crust in terms of density, but the mantle is denser than both. This assertion is accurate. The right response in this case is option C.
Two tectonic plates separate at mid-ocean ridges, when molten magma rises to build new oceanic crust. This crust grows older, colder, and denser over time as it advances further from the ridge.
A terrestrial planet's crust is its outermost layer. The majority of the Earth's crust is made up of the denser, younger oceanic crust and the older, heavier continental crust. Information about the dynamic geology of the Earth's crust is provided via plate tectonics.
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