Well, there are a few formations ; sills, loccoliths, lopoliths, dykes, layered igneous intrusions and batholyths.
Extrusive igneous rock will form from the solidification of magma that has reached the surface.
Intrusive igneous rocks.
They are called intrusive igneous rocks.
The two types are extrusive igneous rock, which solidifies from magma on the surface, and intrusive igneous rock, which solidifies below the surface. Basalt is extrusive, granite is intrusive.
The type of igneous rock that hardens under the earths surface is called the Intrusive Igneous Rock. Intrusive Igneous Rocks are of two main types, Hypabasal and Plutonic. The plutonic forms at deeper depths.
When magma solidifies before reaching Earth's surface it is called intrusive igneous rock, plutonic rock, a pluton. Igneous rock is formed from crystallization of molten magma.
Obsidian
They are called intrusive igneous rocks.
Extrusive (Volcanic) igneous rock.
The two types are extrusive igneous rock, which solidifies from magma on the surface, and intrusive igneous rock, which solidifies below the surface. Basalt is extrusive, granite is intrusive.
Intrusive igneous rock
The type of igneous rock that hardens under the earths surface is called the Intrusive Igneous Rock. Intrusive Igneous Rocks are of two main types, Hypabasal and Plutonic. The plutonic forms at deeper depths.
If the magma has hardened before being exposed at the surface it would be considered an intrusive igneous rock. It is hardens at or near the surface, it would be called extrusive igneous rock.
When magma solidifies before reaching Earth's surface it is called intrusive igneous rock, plutonic rock, a pluton. Igneous rock is formed from crystallization of molten magma.
Obsidian
It is called extrusive igneous rock.
Igneous
Igneous rocks do form on the earths surface. A volcano erupts and the lava that comes out cools and hardens forming igneous rocks.
Igneous rock. Extrusive igneous rock forms at or near the surface, intrusive igneous rock forms below the surface.