Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or ...

An igneous rock has come to be regarded, more constantly than before, not merely as a mineral-aggregate, but as-the product of consolidation of a molten rock-magma; and consideration has been ...

This process can occur either below the Earth’s surface, forming intrusive or plutonic igneous rocks like granite, or at the surface following a volcanic eruption, producing extrusive or ...

Igneous rocks close igneous rockIgneous rocks ... If magma erupts on the surface as lava, it will form extrusive rock, e.g. basalt. These rocks are formed when magma solidifies.