What is the inside of Earth made of?

  • The uppermost layer over the earth’s surface is called the crust. It is the thinnest of all the layers. It is about 35 km. on the continental masses and only 5 km. on the ocean floors. The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina). 
  • The oceanic crust mainly consists of silica and magnesium. it is therefore called sima (si-silica and ma-magnesium). Just beneath the crust is the mantle which extends up to a depth of 2900 km. below the crust.
  • The innermost layer is the core with a radius of about 3500 km. It is mainly made up of nickel and iron and is called nife (ni – nickel and fe – ferrous i.e. iron).

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