Lithosphere

The lithosphere is the outermost layer of the Earth. In this article, let us understand its definition, composition and different types of the lithosphere.

Table of Contents

What is Lithosphere?

The lithosphere is the rigid, outermost shell on Earth. It is composed of the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater. The outermost shell of a rocky planet, the crust, is defined on the basis of its chemistry and mineralogy.

Image of Lithosphere

This includes the crust and the uppermost mantle, which constitute the hard and rigid outer layer of the Earth. The uppermost part of the lithosphere that chemically reacts to the atmosphere, hydrosphere, and biosphere through the soil-forming process is called the pedosphere.

The video explains the layers of the Earth

Lithosphere Composition

The earth’s crust is not a homogeneous substance; it has different layers of rocks including sedimentary rocks on top, granitic and metamorphic rocks in the middle, and basaltic rocks on the bottom.

The earth’s crust also consists of several large dynamic tectonic plates. These tectonic plates move slowly but continuously at an average rate of around 10 cm. Considering this, there was no Atlantic Ocean, and North America and Europe together were one continent 180 million years ago. The Atlantic Ocean came into being because of the drifting apart from the Eurasian and North American plates.

Types of Lithosphere

There are two types of lithosphere:

  • Oceanic: Which is associated with oceanic crust and exists in the ocean basins.
  • Continental: This is associated with continental crust.

Frequently Asked Questions – FAQs

Q1

What is Lithosphere?

The term lithosphere refers to the Earth’s rigid, rocky outer layer. It is made up of the crust and the uppermost solid layer of the mantle. Furthermore, it extends to a depth of about 60 miles. It disintegrates into a dozen separate, rigid blocks or plates.
Q2

Why is Lithosphere important?

It’s crucial because it’s where the living things on Earth thrive and strive. The lithosphere provides us forests, grasslands for grazing land for agriculture and human settlements and is also a rich source of minerals.
Q3

What are the different types of Lithosphere?

There are two types of lithosphere:
i) Oceanic
ii) Continental
Q4

What is Pedosphere?

The pedosphere is the uppermost layer of the lithosphere that, through the soil-forming process, chemically reacts with the atmosphere, hydrosphere, and biosphere.
Q5

What is the composition of Earth’s crust?

The earth’s crust is layered, with sedimentary rocks on top, granitic and metamorphic rocks in the centre, and basaltic rocks at the bottom. A number of huge active tectonic plates make up the earth’s crust.

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