Question

The innermost layer of the Earth is ______.
A- Crust
B-Core
C- Mantle
D- Magma

Answer 1

Hint:
The surface of the Earth consists of three layers. In size, composition, temperature and pressure, every layer varies greatly. These layers are classified mainly on the basis of their position relative to each other.

Complete answer:
The Earth is divided into three major layers- Crust (outermost), mantle and core (innermost).
Three main layers are classified into the Earth-Crust (outermost), mantle and core (innermost).

Crust: the outermost and thinnest layer of our world is the firm crust. The thickness of the crust reaches 25 miles (40 kilometres) and is divided into fifteen main tectonic plates that are rigid in the middle and have volcanic activity, such as earthquakes and volcanism, at the borders. In the crust of Earth, all three rock forms (ignorant, sedimentary, and metamorphic) can be found.

Mantle: Between the core and the crust lies the mantle. The content of the mantle is hot and dense (932 to 1,652 degrees Fahrenheit, 500 to 900 degrees Celsius) and moves like a semi-solid rock.

Core: It is the Earth's innermost layer. The very hot, very dense centre of our world is the Earth's nucleus. Under the cool, brittle crust and the mostly-solid mantle lies the ball-shaped heart. The heart is located about 2,900 kilometres (1,802 miles) below the surface of the Earth and has a radius of about 2,165 miles (3,485 kilometres).

For three major reasons, the Earth's core is important:

(1) it is responsible for producing the magnetic field of the Earth; (2) it provides knowledge about the planet's earliest history of accretion; and (3) thermal and compositional characteristics developed when the core formed largely dominated the core's subsequent evolution and also influenced the evolution of the mantle, crust, and atmosphere.

Therefore, the correct answer is B

Note:
Magma is an extremely hot liquid and semi-liquid rock located under Earth's surface. Much of the planet's mantle consists of magma. Magma layer is found between the core and crust of the Earth.