How are igneous rocks found?

Igneous rocks form from magma and lava that cools and solidifies. As this happens, the magma or lava crystallizes, creating igneous rock, of which there are many variations. Igneous rocks come in two types, extrusive and intrusive. Igneous rocks are split into these two categories based upon how they cool. read more

Where Igneous Rocks Are Found The deep sea floor (the oceanic crust) is made almost entirely of basaltic rocks, with peridotite underneath in the mantle. Basalts are also erupted above the Earth's great subduction zones, either in volcanic island arcs or along the edges of continents. read more

Igneous rocks can be found wherever volcanic activity has brought, or is bringing, magma, ash etc. to the surface where they form basalt, tufa etc. There are also igneous rocks that form underground, and have become exposed by erosion, eg. granites, intrusive dykes. read more