Earth’s core is mainly made up of ______.

The correct answer is nickel and iron.

Key Points

Core:

• The innermost layer is the core with a radius of about 3500 km.
• The central core has a very high temperature and pressure.
• The inner core (1200 km) is in the solid state whereas the outer core (2300 km) is in the liquid state.
• The innermost layer is the core with a radius of about 3500 km and divided into Inner and Outer core.
• The inner core is with a radius of 350 km mainly made up of- nickel and iron. The innermost layer is also called ‘nife’ (ni - nickel and fe - ferrous- iron).

Additional Information

The Earth is divided into four main layers: the solid crust on the outside, the mantle, the outer core, and the inner core.

• All those layers are separated from each other through a transition zone.
• These transition zones are called discontinuities.
  • Conrad Discontinuity: It lies between the Upper crust and Lower crust.
  • Mohorovicic Discontinuity: It lies between crust and mantle.
  • Repiti Discontinuity: It lies between the Upper mantle and Lower mantle.
  • Gutenberg Discontinuity: It lies between core and mantle.
  • Lehman Discontinuity: It lies between the upper core and lower core.

Interior of the Earth:

Crust:

• The uppermost layer over the earth’s surface is called the crust.
• It is the thinnest of all the layers.
• on the continental masses, It is about 35 km and on the ocean floors, only 5 km.
• The crust is the thinnest layer of the Earth and it amounts to less than 1% of our planet's volume.
• The earth is made up of several concentric layers with one inside another, just like an onion.
• The crust is the outermost layer of Earth and is made up of igneous, metamorphic, and sedimentary rocks. 
• The Earth's crust is unstable because of the exogenic forces.

Mantle:

• The Mantle extends up to a depth of 2900 km below the crust.
• It is the widest section of the Earth.