magmakiviin

Magmakiviin is a Finnish term that translates to "magma rock" or "igneous rock." It refers to any rock formed from the cooling and solidification of molten rock material, such as magma or lava. This category of rocks is one of the three main rock types, alongside sedimentary and metamorphic rocks. Magma is molten rock found beneath the Earth's surface, while lava is molten rock that has erupted onto the surface.

The formation of magmakiviin involves two primary processes: intrusive and extrusive. Intrusive magmakiviin, also known as plutonic rocks, form when magma cools and solidifies slowly beneath the Earth's surface. This slow cooling allows large mineral crystals to form, resulting in coarse-grained textures. Examples include granite and gabbro. Extrusive magmakiviin, also known as volcanic rocks, form when lava cools and solidifies quickly on the Earth's surface. The rapid cooling results in smaller mineral crystals or even a glassy texture. Examples include basalt and obsidian.

The composition of magmakiviin varies depending on the original magma or lava. It can be rich in silica, such as in felsic rocks like granite, or it can be silica-poor, like in mafic rocks such as basalt. The minerals present, their size, and their arrangement are key characteristics used to classify different types of magmakiviin. These rocks play a significant role in the Earth's crust and are often sources of valuable mineral resources.