Extrusive, or volcanic, igneous rocks are formed when molten hot material cools and solidifies. There are three main types of rocks: sedimentary, igneous, and metamorphic.
What Are the Three Different Types of Rocks?
Rocks are one of the most basic geologic materials and are composed of one or more minerals. Rocks can be classified according to their composition and texture.
The three main types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks are rocks that form from solidified lava or magma. Igneous rocks are the most common type of rock and make up the Earth‘s crust.
Most igneous rocks are found in the Earth‘s mantle and crust. The Earth‘s crust is made up of about 12% igneous rock.
Sedimentary rocks are rocks that form from particles of other rocks that have been deposited and cemented together. Sedimentary rocks make up about 75% of the Earth‘s crust.
The most common type of sedimentary rock is sandstone. Metamorphic rocks are rocks that have been changed by heat, pressure, or chemicals.
Metamorphic rocks are often found in the Earth‘s crust but can also be found in the mantle and crust. Metamorphic rocks make up about 13% of the Earth‘s crust.