Inside the Earth

Layers of the Earth

The earth, our homeland is a dynamic planet. It is constantly undergoing changes inside and outside

Do you know? The deepest mine in the world is in South Africa. It is about 4 km. deep. In search of oil, engineers have dug a hole about 6 km. deep. 

the earth is made up of several concentric layers with one inside another

The uppermost layer over the earth’s surface is called the crust. It is the thinnest of all the layers. It is about 35 km. on the continental masses and only 5 km. on the ocean floors. The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina). The oceanic crust mainly consists of silica

Just beneath the crust is the mantle which extends up to a depth of 2900 km. below the crust. deep on the ocean floor. Crust Lithosphere core-mantle boundary Mantle Outer core Inner core The innermost layer is the core with a radius of about 3500 km.