Internal Structure Of The Earth

The Earth’s internal composition comprises three concentric layers: (a) The crust, also known as the lithosphere. (b) The mantle, referred to as the mesosphere. (c) The core, known as the barysphere.   The Crust: The crust can be further divided into upper and lower sections. The upper crust, forming the continents, is composed of granite […]

The Earth’s internal composition comprises three concentric layers:

(a) The crust, also known as the lithosphere.

(b) The mantle, referred to as the mesosphere.

(c) The core, known as the barysphere.

 

The Crust:

The crust can be further divided into upper and lower sections. The upper crust, forming the continents, is composed of granite rocks, with silica and aluminium as the main minerals collectively known as SIAL. It has an average density of 2.7. The lower part of the Earth’s crust, constituting the ocean floor, is made up of basalt rocks containing minerals like silica, iron, and magnesium, collectively referred to as SIMA, with an average density of 3.0.

 

The Mantle:

Located just beneath the crust, the mantle is approximately 290 km thick and has a density of 3.3. The main mineral in this zone is olivine, and it exists in a plastic and semi-liquid state.

 

The Core:

Situated at the Earth’s innermost part, the core has a radius of about 3500 km. Comprised of two minerals, iron and nickel (NIFE), the core reaches extremely high temperatures, estimated to be as high as 2000°C, and is in a molten state.

Related Posts:

Structure Of The Earth

Calculation Of Distances And Local Time

Latitude & Longitude

Earth As A Planet

The Solar System

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top