There are three types of rocks.  One of them is the igneous rock it forms when molten rocks cools and become solid.  From under the surface or on the surface the igneous rock can form.  Igneous rock are referred to intrusive or extrusive depending in where they form.  You can see the extrusive  igneous rock at the Earth’s surface but, the intrusive igneous rock forms within Earth.  Another type of rock is the sedimentary rock it forms when pieces of minerals and rocks, plants, and other loose materials get pressed or cemented together.  The last type of rock is the metamorphic rock it forms when heat or pressure causes older rocks to change into new types of rocks.

Rocks can change into other types of rocks when rocks ae raised to the surface.  Water and wind can break them down into sediments.  Sometimes the sediments might become sedimentary rocks.  The rocks might become metamorphic rocks if the rocks at or near the surface are pushed deeper into the crust.  They might also melt and mountains are forming rocks can be raised up or pushed deeper in the mountains.

All three types of rocks are found in the Earth’s crust.  The three rock types aren’t evenly distributed.  The sedimentary rock forms a thin covering on Earth’s surface wich makes up 5% of the crust.  The igneous and metamorphic rock consists most of Earth’s crust which is 95%.

Cycle · igneous · metamorphic · Rock · sedimentary