Internal Structure of The Earth

Internal Structure of The Earth

Internal Structure of The Earth
The Earth’s Crust: The outermost solid cover or shell of the earth is known as the earth’s crust.
⇒ The thickness of the crust is about 30 km.
⇒ It is thicker in the region of the continents and thinner in the region of the ocean floors.
⇒ The density of the rocks in the earth’s crust ranges from 2.7 to 3 g/c.c (grams per cubic centimeter).
⇒ The upper part of the crust consists of silica and aluminium in greater proportions. That is why, it is called ‘SIAL’.
Mantle : This layer lies below the crust. The lower part of the crust is called ‘SIMA’ because the proportion of silica and magnesium is higher in this part.
⇒ Its thickness is about 2900 km and the density of substances in the mantle ranges from 3.0 to 4.7.
Core: The earth’s corelies below the mantle. Its thickness may be about 3,471 km.
⇒ Its radius is 6,371 km., according to IUGG.
⇒ It is divided into two parts-the outer core and the inner core. The outer core is probably in a liquid state and the inner core in a solid state.
⇒ The core mainly consists of Nickel and Ferrous i.e. Iron. Hence, it is called ‘NIFE’.
⇒ After the mantle, the earth’s density goes on increasing rapidly towards its centre and finally is more than 13.
⇒ The temperature of the central part of the earth may be about 5000°C.
⇒ The study of the earth’s interior helps us to understand the original rocks in the earth’s crust and their later transformation.

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