Question

describe the interior of earth​

Answer 1

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The earth is sphere with a radius about 6400 km. To find the inner structure of the earth, we would have to go down right up to it centre. Obviously, that is not possible. So, scientist have taken the help of earthquakes to determine the structure of the earth. During earthquakes, vibrations are produced. Just as the vibrations of a string of a musical instrument produce sound waves, I the earth's vibration produce seismic waves. Seismic waves travel through different materials inside the earth at different speeds. They also get when when they passed from one kind of material to another. By observing the path and speed of a seismic waves , scientist can find out the types of and arrangements of the materials through which it passed. From such observations we now know that the Earth consists of three concentric layers - The crust, the Mantle, and the core.

The crust - the uppermost layer of the lithosphere is called the crust. The crust is very thin with an average thickness of about 35 km. Please if we could think of the earth as an egg The crust could be regarded as the shell. However, The crust is not uniformly thick at all places. It is only about 8 cm thick under the oceans and about 40 km thick under the continents.
The upper part of the Continental crust, which is rich in silica and aluminium is called sial . The lower part of the continental crust and the whole of the oceans Crush are composed mainly of denser materials rich in silica and magnesium . They are together called Sima. The example, Mount Everest the highest mountain peak in the world is 8848 metres above sea level while the world's deepest point located in the Mariana Trench in the Pacific Ocean, is about 11000 metres below sea level.

The Mantle - below The crust lies the mantle . The boundaries between the Crust and the Mantle is called Mohorovicic discontinuity , or simply moho . It is named after it's discover andrija Mohorovicic , a Croatian scientist .
The Mantle extends up to the depth of about 2900 km. Its chief continents are silicates of iron and magnesium . Both the temperature and the density of the mantle increase with increasing depth towards the centre of the earth.

The core - the innermost layer of the earth is called core. It is about 3500 km thick. It is believed to be made up of heavy metal like Iron and Nickel , and is called nice.
The temperatures at the core are high enough to melt all metals. The study of seismic waves show that the outer part of the core is molten. However the innermost part is solid due to the presence of the layer above. The flow of molten iron in the outer core makes the earth behave like a huge magnet.
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