Coherent lava can be formed as a result of outward movement of magma to the surface of the earth. In the movement of magma can really get out into the earth's surface is melted (effusive eruptions), or frozen near the surface, or partly frozen on the bottom and partly frozen on the surface of the earth. The frozen magma near the surface is known as shallow igneous intrusion. Synonym for this shallow igneous intrusions are numerous, among other sub-volcanic intrusive rocks, volcanic rocks spring, subvolcanic intrusions, high-level intrusives, shallow intrusions, low-level intrusions, syn-volcanic intrusions
