Here's a breakdown:
* Basalt: A dark-colored, fine-grained volcanic rock rich in magnesium and iron. It makes up the majority of the oceanic crust, formed by the cooling and solidification of magma erupted from mid-ocean ridges.
* Gabbro: This is a coarse-grained igneous rock that has the same mineral composition as basalt. It's found in the deeper layers of the oceanic crust.
* Other minerals: The oceanic crust also contains smaller amounts of other minerals like olivine, pyroxene, and plagioclase feldspar.
It's important to note that the composition of oceanic crust can vary slightly depending on location and depth, but basalt remains the dominant component.
