Discussion
The oceanic crusts are mainly composed of ................... type of rock.
Answer: C
Oceanic crust is mainly composed of basalt.
Oceanic crust forms at mid-ocean ridges, where magma from the mantle rises and solidifies. Its upper layers are basalt lavas and dykes, with its coarse-grained equivalent, gabbro, below. That basaltic (sima) composition makes it denser and thinner than continental crust.
Granite is the characteristic rock of the continental crust (sial). Andesite is typical of volcanic arcs above subduction zones, such as the Andes, rather than of the ocean floor. Mud is a sediment that may lie on top of the crust, not the crust itself.
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