How many types layer of earth

There are three layers of earth

The Inner Core

It is the centre and the hottest layer of the Earth. The inner core is solid and made up of iron and nickel with temperature up to 5,500^oC. Due to its immense heat energy, the inner core is more like the engine room of the Earth.

The Outer Core

The outer core of the Earth is similar to a very hot ball of metals, whose temperature is around 4000 ^oF to 9000⁰F. It is so hot that the metals inside are all in the liquid state. The outer core is located around 1800 miles under the crust and approximately 1400 miles thick. It is composed of metals such as iron and nickel. The outer core surrounds the inner core.

The inner core has pressures and temperatures so high that the metals are squeezed together and not able to move like a liquid, but are forced to vibrate instead of solid.

Mantle

Mantle is the widest section of the Earth. Its thickness is approximately 2,900 km. The mantle is mainly made up of semi-molten rock known as magma. The rock is hard in the upper part of the mantle, but lower down the rock is softer and begins to melt.