Question

Inner core of earth is made up of:
A. Copper
B. Iron
C. Nickel-iron alloy
D. Platinum

Answer 1

Hint: Earth is a planet of the solar system. It is divided into four layers namely mantle, crust, inner core and outer core. The outermost layer is called Outer core while the innermost layer is called Inner core. This bifurcation of Earth's layer is based on their composition. The temperature in the inner core is very high.

Complete answer:
Earth is divided into 4 layers. These layers are distinguished on the basis of their physical properties. The four layers are:

Crust: It is the outermost layer of the Earth. This layer consists of silica, aluminium, lime, magnesium and iron oxide.
Mantle: It is the layer below Earth's crust. This layer is more thick as compared to the crust. This layer mostly consists of silicate rocks, magnesium and iron.
Outer core: Layer below the mantle is outer core. It has a very high temperature. Nickel is found in this layer.
Inner core: This is the central layer of Earth. It has the maximum temperature. This layer is made up of nickel-iron alloy.

Thus, the inner core is made up of nickel and iron alloy.

So, the correct answer is “Option C”.

Note:
Earth's crust is the thinnest layer of Earth. It is the surface on which we live or stand. All the structures which we see on earth lie on the Earth's crust. Even though the inner core is the hottest and has the highest pressure, the nickel-iron alloys are in solid form and not in liquid state. While the nickel in the outer core is in solid form.