The pillow form of this rock is created when it is quickly cooled by water.
The Giant's Causeway is made from this type of rock as are Lunar mare. The pillow form of this rock is created when it is quickly cooled by water. It is chemically similar to gabbro. This rock has relatively less silica, but plenty of calcium and magnesium making it mafic. This extrusive rock makes up much of the oceanic crust. For 10 points, name this igneous rock that is often contrasted with granite.
The Giant's Causeway is made from this type of rock as are Lunar mare.
basalt