The Most Important Rock Types

Igneous Rocks:

 
Such as granite and basalt.
It formed as a result of freezing Liquid volcanic , where volcanic freeze 95% of them because of volcanoes and  5% as a result of melting of sedimentary and metamorphic rocks.

Metamorphic Rocks:

Such as ore and gneiss and schist.

Metamorphic rocks formed in the rocks of the earth at great depths under the influence of pressure and temperature, which led to the occurrence of chemical reactions led to the change in the chemical composition of minerals within the rock.

Sedimentary Rocks:

Such as limestone and sandstone. 

deposition of mud and stone material dissolved or fragmented remnants of rocks subjected to mechanical and chemical factors.
Sedimentary rocks represent about 75% of the rocks of the earth's crust
Are located at depths close to the Earth's surface.