Question

According to the theory of plate tectonics, the__. A. asthenosphere is divided into plates. . . B. lithosphere is divided into plates. . . C. asthenosphere moves over the lithosphere. . . D. asthenosphere is strong and rigid. .

Answer 1

Lithosphere is divided into plates.  

Further Explanation:

Plate tectonics theory deals with the dynamics of the outermost part or shell of the earth. This outer shell is known by the name of Lithosphere and Plate tectonics revolutionized the earth sciences by providing acute and uniform understanding of the evolution of mountains, volcanoes as well as earthquakes and it also tells about the time of the evolution of the earth.  

This concept of plate tectonics came in year 1960 and according to this theory, the outer layer which is very rigid is known as lithosphere and this layer is around 100 km in thickness.Further, lithosphere isbroken into seven very large continental and ocean sized plates along with other small plates and these plates are some way or the other, relative to each other and these plates move at the rate of 2 to 4 inches every year.  

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Answer Details:

Grade: High School

Chapter: Plate Tectonics

Subject: Geography

Keywords: Plate tectonics, Lithosphere, Earthquake, Volcano, Evolution, Mountains, Thickness, Continental, Oceans, Revolutionized.

Answer 2

Answering the question, according to the theory of plate tectonics, the lithosphere is divided into plates. This implies the correct answer is B.

The lithosphere, the outer shell of the earth is composed of nine major different plates.  These plates are named based on the landforms that are found on each of them.  Also the crust and part of the upper mantle join together to form the lithosphere.

Further Explanation

All the important major plate include

1. Australian
2. North American
3. Indo Australian
4. South American
5. African
6. Indian
7. Pacific
8. Antarctic
9. Eurasian

Out of all the major plates, the Pacific plate is the largest and has 39,768,522 square miles and also equivalent to 103,000,000 square kilometers. Most of this plate can be found below the ocean.

The evolution of the theory of plate tectonics is one of the recent major discoveries by scientists.

According to the theory, the earth’s crust or the outer layer is made up of a series of plates consisting of lithospheric material that floats over the denser asthenosphere on the upper mantle across the Earth’s interior.

In other words, the outer layer, or the earth’s crust along with the upper mantle is splits into different sections and that the Earth is composed of plates.

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KEYWORDS:

• theory
• plate
• lithosphere
• tectonics
• earth
• crust
• outer layer