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Igneous rocks are formed through the cooling and solidification of magma or lava. They are a fundamental part of Earth’s crust and provide insights into the planet’s geological processes.
Types of Igneous Rocks
There are two main types of igneous rocks: intrusive and extrusive. Intrusive rocks form below Earth’s surface and cool slowly, resulting in large crystals. Extrusive rocks solidify quickly on the surface, leading to fine-grained textures.
Role in Earth’s Geological History
Igneous rocks help scientists understand volcanic activity and the formation of Earth’s crust. They also record information about Earth’s interior and past tectonic movements.
Interesting Facts
- Granite is one of the most common intrusive igneous rocks and is widely used in construction.
- Basalt, an extrusive igneous rock, covers much of Earth’s ocean floors.
- Obsidian is a volcanic glass formed from rapidly cooled lava, known for its sharp edges.
- Igneous rocks can contain valuable minerals like gold, copper, and diamonds.