Three types of rock
There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers. Metamorphic rocks result when existing rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water. Most rocks are made of minerals containing silicon and oxygen, the most abundant elements in the Earth’s crust.
Topic: Earth Science
Subtopic: Minerals and Resources
Keywords: Oxygen, Geology, Metamorphic rocks, Sedimentary rocks, Silicon, Igneous rocks
Igneous rocks solidify from molten rock (called magma within the Earth and lava on the surface).
Sedimentary rocks are layered.
Metamorphic rocks form when sedimentary, igneous, or pre-existing metamorphic rocks are changed by heat, pressure, and chemically reactive waters.