Crust is the outermost layer of a planet. The upper portion of lithosphere is known as earth-crust. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. Earth-crust is covered by either water or soil. Most of the earth-crust is covered by water. The rest portion is covered by dust particles or stone chips. If it is made by organic substances and is soft state, it is called soil.
The crust of the Earth is busted into many pieces called plates. The plates “float” on the soft, plastic layer which is situated below the crust. These plates typically move along smoothly but sometimes they stick and build up pressure. The pressure builds and the rock bends until it snaps. When this occurs an Earthquake is the result!
Earth-crust is an important part for the human being. We live on this part of the earth. We produce our essential foods on the soil. Besides, there are minerals in the soil which we use for different purposes. The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth’s structure.