Extrusive Rocks: These rocks are formed when magma erupts onto the Earth's surface and cools quickly.
* Basalt: This is a dark-colored, fine-grained rock that is very common. It is formed from the eruption of mafic magma, which is rich in magnesium and iron. Basalt is the main component of the oceanic crust.
* Rhyolite: This is a light-colored, fine-grained rock that is formed from the eruption of felsic magma, which is rich in silica. Rhyolite is often found in volcanic domes and flows.
* Andesite: This is an intermediate rock that is formed from the eruption of intermediate magma. Andesite is often found in stratovolcanoes.
* Obsidian: This is a volcanic glass that is formed when lava cools very quickly. Obsidian is often black or dark green in color.
Intrusive Rocks: These rocks are formed when magma cools slowly beneath the Earth's surface.
* Gabbro: This is a dark-colored, coarse-grained rock that is the intrusive equivalent of basalt.
* Granite: This is a light-colored, coarse-grained rock that is the intrusive equivalent of rhyolite.
It's important to note that the specific type of igneous rock that forms depends on various factors such as the composition of the magma, the rate of cooling, and the pressure conditions.
Let me know if you'd like to explore any of these rock types in more detail!
