Rocks are composed of minerals and are usually an amalgam of large number of minerals. Rocks are classified into three categories based on the processes through which they are formed. Rocks are classified into sedimentary, igneous, and metamorphic.
Sedimentary rocks are formed through lithification of tiny parts. This type of rock is formed when layers of sediment including sand, mud, minerals and gravel settle at the bottom of the ocean and pressed together for thousands of years. Examples of sedimentary rocks are limestone, coal and sandstone.
Igneous rocks are formed through cooling of molten lava. When magma is cooled beneath the surface of the earth intrusive formation of igneous rocks happen and when magma is cooled on the surface of the earth extrusive formation of igneous rocks happen. Examples of igneous rocks are basalt, and granite.
Metamorphic rocks are formed when igneous or sedimentary rocks are subjected to metamorphosis through heat, pressure or water. Examples of metamorphic rocks are slate, marble, and quartzite.
Sedimentary rocks are formed through lithification of tiny parts. This type of rock is formed when layers of sediment including sand, mud, minerals and gravel settle at the bottom of the ocean and pressed together for thousands of years. Examples of sedimentary rocks are limestone, coal and sandstone.
Igneous rocks are formed through cooling of molten lava. When magma is cooled beneath the surface of the earth intrusive formation of igneous rocks happen and when magma is cooled on the surface of the earth extrusive formation of igneous rocks happen. Examples of igneous rocks are basalt, and granite.
Metamorphic rocks are formed when igneous or sedimentary rocks are subjected to metamorphosis through heat, pressure or water. Examples of metamorphic rocks are slate, marble, and quartzite.
