* Formation: Igneous rocks are formed from the cooling and solidification of magma (molten rock) or lava. This process is fundamental to the Earth's geological cycle.
* Vast Amounts of Magma: The Earth's mantle, which lies beneath the crust, contains vast amounts of molten rock. This magma constantly rises and erupts, forming igneous rocks.
* Oceanic Crust: The oceanic crust, which covers about two-thirds of the Earth's surface, is primarily composed of basalt, a type of igneous rock.
* Continental Crust: While continental crust is more diverse, it still contains a significant amount of igneous rock, including granite.
While sedimentary and metamorphic rocks are also important parts of the Earth's crust, the sheer volume of igneous rock formed through the continuous process of magma cooling and eruption makes it the dominant rock type.
