SOLAR SYSTEM

Detailed explanation-1: -Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust. (Basalts are a sima rocks.)

Detailed explanation-2: -Basalt makes up a 2 to 4 kilometer thick layer of ocean crust that covers 50% to 60% of the Earth’s surface and thus basalts are the most abundant rock type in the Earth’s crust.

Detailed explanation-3: -Since the oceanic plates are heavier and more dense sediments undergo more pressure as they are being formed. The lava that forms the oceanic crust comes directly from the mantle. It is more dense and is formed of basaltic rock.