If we were to drill a hole down to the mantle, the oceanic crust would be the best place to start.
The oceanic crust is the uppermost layer of the oceanic portion of the Earth's lithosphere, more specifically the tectonic plates. It is composed of the upper oceanic crust and the lower oceanic crust. It is also thicker and denser than continental crust.
The oceanic crust is made up of two types of rocks mostly: basalt and gabbro.
On the other hand, the continental crust is the outermost layer of the Earth's surface that is composed of granitic, sedimentary, and metamorphic rocks.
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