The Earth is believed to have formed about $4.5$ billion years ago.
At the time of origin it was in extremely hot aerated form. The temperature usually rises by $1\ C$ at a depth of $32\ m$ from the earth's surface toward the center.
Near the surface of the earth is a thin layer of rocky rocks. Which is called solidification.
It has two subdivisions.
$(1)$ Bhukvach and $(2)$ Geosynthetic Sial layer of granite rocks we are composed of layer of basalt rocks in Sai.
Below the cube is a mantle or mantle to a depth of $2880 \ km.$
It is called the earth.
It is also called the central metal.
Its diameter is $6020 \ km.$
The nickel and iron minerals are predominant in this layer, so it is called neph.
The gravitational force of the earth is due to this metal. Land forms are formed as a result of oceanic processes and interactions that take place underground.