What are the inner shells of the earth?

The inner shell of our planet is distinguished by three main layers. The first layer on which we live is called the Earth’s crust. It plunges towards the center of the earth for 33 -75 km. Has a density of 2.7-3 gr. per cm cubic. The Earth’s crust occupies 0.8% of the entire mass of the planet. The middle layer is the Mantle. It consists of an outer layer, a transition layer and a bottom layer. is located at a depth of 33-75 to 2900 km. And the center of our planet is the Core. As well as the Mantle, it consists of three layers, external, transitional and internal. At a depth of 2900 km. up to 6371 km.