Crust

The outermost layer of the earth is the Crust. It is fragile (weak). The thickness of the crust fluctuates under the maritime (5 km) and continental regions (35 km).

The oceanic crust is more slender when contrasted with the continental crust. The continental crust is thicker in the space of significant mountain frameworks. The crust is made of heavier rocks having a density of 5g/cm3. The rocks seen in the oceanic crust are basalt and the mean density is 2.7g/cm3. The discontinuity between the hydrosphere and crust is called Conrad Discontinuity.

Major constituent minerals are Silica (Si) and Aluminum The crust itself is partitioned into two sub-layers as oceanic crust and continental crust. The continental crust is a lot thicker than the oceanic crust. 

Oceanic Crust 

The crustal mass existing under the seas is around 10 km thick. It is by and large comprised of rocks wealthy in iron and magnesium.  The explanation is that this layer is overwhelmed by generally weighty, dull, thick shakes of “mafic” arrangement. The greater part of these mafic rocks are volcanic in beginning and are designated “basalts.”

Continental Crust

This crustal mass makes up the continental layer. The continental crust is around 30 to 50 km in thickness. It is comprised of igneous, metamorphic, and sedimentary rocks. The oceanic crust is thicker than the continental crust. The continental crust is comprised of lightly shaded rocks. These stones are essentially made out of silicates, improved in lighter components, like aluminum, potassium, and sodium. Consequently, this layer is called “SiAl”.

Lithosphere

It is the earth’s rigid outer layer, with a thickness that ranges from 10 to 200 km. It consists of both the crust and the upper part of the mantle. Lithosphere is divided into tectonic plates, which move and create large-scale changes to the geological structure of the earth.

Asthenosphere

This lies below the lithosphere extending up to 80-200 km and rigid lithosphere can easily move over because the asthenosphere is soft. Its vicious, brittle, and ductile and density is higher than the crust. It is a primary source of magma that rises to the surface during eruptions of volcanos.

The interior of the earth is divided into three layers- Crust, Mantle, and Core. Crust refers to the outermost layer of the earth, the mantle is the portion of the interior beyond the crust and Core refers to the innermost layer of the earth.