Question

How is the inner core of the earth?
(A) Liquid
(B) Solid
(C) Both A and B
(D) None of these

Answer 1

Hint: The Earth's core is the very hot and dense core of our planet. Underneath the cool, porous crust and the mostly solid mantle is a ball-shaped center. The center is approximately 2,900 kilometers (1,802 miles) below the surface of the Earth, with a circumference of about 3,485 kilometers (2,165 miles).

Complete answer:
The nucleus of the Earth is older than the planet itself. Earth was a uniform ball of hot rock when it formed around 4.5 billion years ago. The ball becomes much hotter as a result of radioactive decay and leftover heat from the planetary formation (the collision, accretion, and compression of space rocks).
Iron, nickel, and other heavy metal droplets gravitated to the Earth's nucleus, forming the early core. The planetary distinction is the name given to this crucial method. The geothermal gradient's furnace is the Earth's core. The geothermal gradient is a measurement of the rise in heat and pressure within the Earth's core.

Now, let's look into each option:
Option (A) Liquid: This option is incorrect as we know that the earth’s core is made up of nickel, iron, and heavy metals which don’t exist as a liquid.
Option (B) Solid: This option is correct as the inner core of the earth is solid.
Option (C) Both A and B: Both A and B are not correct, Only B is correct. Hence this option is incorrect.
Option (D) None of these: This is an incorrect option like one of these is correct.

Hence, Option (B) Solid is the correct answer.

Note: The outer core, which borders the mantle, and the inner core are the two layers that make up the core. The Bullen discontinuity is the line that divides these two areas.