Igneous Rock - formed by the cooling and solidifying of molten materials.Igneous rocks can form beneath the Earth's surface,
or at its surfaces, as lava.
Sedimentary Rock - that has formed through the deposition and solidification of sedimen, especially sediment transported by water (rivers, lakes, and oceans) ice (glaciers), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils.
Metamorphic Rock- that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase.