Question
Describe the interior of the earth.
✓
Answer
Interior of the Earth:The earth is made up of several concentric layers with one inside another, just like an onion.
Crust:
Mantle:
Crust:
- The uppermost layer on the earth's surface is called the crust.
- It is the thinnest of all the layers.
- It is about 35km, thick on the continental masses and only 5km thick on the ocean floors.
- Main minerals constituent 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).
Mantle:
- Just beneath the crust is the mantle.
- It extends up to a depth of 2900km below the crust.
- The innermost layer is the core with a radius of about 3500km.
- It is mainly made up of nickel and iron.
- Hence it is called nife (ni- nickel and fe- ferrous i.e., iron).
- The central core has very high temperature and pressure.
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