Question

Interior of the earth​

Answer 1

Answer:

The Earth is divided into three main layers. The dense, hot inner core (yellow), the molten outer core (orange), the mantle (red), and the thin crust (brown), which supports all life in the known universe.

Explanation:

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Answer 2

☯INTERIOR OF THE EARTH

On the basis of the composition, properties of rocks and their density, the Earth can be divided into three concentric layers-crust, mantle and core.

★Crust

The solid outermost layer of the Earth, composed of rocks and minerals, is called the crust or the lithosphere. This is the thinnest of all layers. The surface of the crust is covered with soil and contains a lot of minerals,

• The crust consists of two distinct layers-the upper continental crust and the lower oceanic crust The crust is thicker on the continental masses and thinner on the ocean basins.

• The main minerals forming the continental crust are silicon (Si) and aluminium (Al), and so it is collectively called sial. The oceanic crust is mainly made up of silicon (Si) and magnesium (Mg), and is called sima.

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★Mantle

The mantle or the mesosphere is the second layer of Earth. It is located beneath the crust and extends up to the core of the Earth. The boundary between the crust and the mantle is known as the Mohorovicic discontinuity or Moho.

• The mantle consists of two layers-the upper mantle and the lower mantle.

• The average thickness of the mantle is about 2,900 km. Its temperature is very high as it contains molten magma. This magma comes to the surface during volcanic eruptions as lava. The mantle is mainly composed of olivine, a combination of iron, magnesium and silicon.

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★Core

The innermost layer of the Earth is called the core or the barysphere. The boundary between the mantle and the core is known as the Gutenberg discontinuity.

• The core also consists of two layers--the outer core and the inner core. The average density of the core is around 13 g per cubic cm, Its radius is around 3,500 km. The temperature in the core ranges from 2200°C to more than 5000°C.The core is also subject to extreme high pressure

• It is composed of nickel (Ni) and iron (Fe). Therefore, the core is also referred to as nife. The metallic nature of the core is said to have given the Earth its magnetic properties.

• The temperature increases at a rate of 1'C for every 32 m increase in depth beneath the crust. Thus, the temperature at the core is extremely high, and the rocks and metals are in a molten state. However, due to the immense pressure of the overlying layers, the core is in a solid state.

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