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Yogita Ingle 6 years, 1 month ago
The Earth is made up of several layers one inside the other, just like an onion. Following are the main layers of the Earth:
Crust
- The crust is the uppermost layer found on the surface of the Earth.
- It is the thinnest of all the layers and is about 35 km on the continental masses and only about 5 km on the ocean floor.
- Two main mineral constituents of the continental mass are silica and alumina. Therefore, continental crust is also called sial.
- The oceanic crust consists mainly of silica and alumina. Therefore, it is known as sima.
Mantle
- This layer of the Earth lies underneath the crust.
- It extends up to a depth of 2,900 km below the Earth’s crust.
Core
- It is innermost layer of the Earth with a radius of
- about 3500 km.
- It is called nife as it is made up of nickel and iron (ni-nickle; fe-ferrous or iron).
- There is very high temperature and pressure inside the Earth’s core.
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Yogita Ingle 6 years, 1 month ago
ATP is called the energy currency of the cell, and of life, because it is the energy molecule that all cells need in order to do anything within the human body. The molecule is used like a battery within cells and allows the consumption of one of its phosphorous molecules.

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