GENERAL KNOWLEDGE

Detailed explanation-1: -The layer of Earth below the crust is called the mantle. It is about 2, 900 km thick and makes up 84% of Earth’s total volume.

Detailed explanation-2: -The layer just below the crust is called the mantle. This layer is the layer of basalt rock which is heavier than the topmost layer. The density of this layer varies from 3.1 to 5.00. The average thickness of this layer is 100 to 2900 km. Silica and magnesium elements predominate and it is popularly known as SIMA.

Detailed explanation-3: -The outer core is the liquid largely iron layer of the earth that lies below the mantle. Geologists have confirmed that the outer core is liquid due to seismic surveys of Earth’s interior. The outer core is 2, 300 km thick and goes down to approximately 3, 400 km into the earth.

Detailed explanation-4: -The mantle lies below the crust and is up to 2900 km thick. It consists of hot, dense, iron and magnesium-rich solid rock. The crust and the upper part of the mantle make up the lithosphere, which is broken into plates, both large and small. To learn more about these plates see the Plate Tectonics page.