THE STRUCTURE OF THE EARTH

THE STRUCTURE OF THE EARTH

• There are three sections inside the earth: the crust, the mantle, and the core.
• The crust is the earth's top layer, and the core, which is 2900 km deep, is its thickest layer.

     Here are the three layers that make up the earth's crust:

The Crust

The Mantle

The Core

IMAGE SOURCE

The Crust

• The crust is the top solid layer of the earth. It is thin and its thickness changes depending on whether it is marine or continental.
• The crust of the ocean is thinner than the crust of the land.
• Where there are big mountain ranges, the continental crust is thicker.
• The crust is made up of rocks that are heavy and have densities of 3 g/cm3.
• The crust of the oceans is home to basalt rocks.
• The base of the ocean is 2.7 g/cm3 in terms of mass.
• Because of this, it is often shortened to SIAL. SIAL can also be utilised for discussions regarding the lithosphere.

The Mantle

• There is a solid part of the Earth's core called the mantle that goes below the surface.
• That part of the shell is less thick than this one.
• It is between 10 and 200 km thick.
• The mantle goes down to a depth of 2,900 km from Moho's fissure.
• The asthenosphere is the top layer of the mantle and the main source of magma that rises to the surface during volcano explosions.
• The crust and the top layer of the mantle make up the lithosphere. It's also called SIMA because silicon and magnesium are important parts of the mantle.

The Core

• About 2,900 km below the surface is where the core and mantle meet.
• The core inside is solid, and the core outside is liquid.
• The core is mostly made up of nickel and iron, which are very heavy metals.
• Because of this, it's sometimes called the "nife" layer.

IMAGE SOURCE (THUMBNAIL)