Question

The rock inside the earth's interior is said to be hot and molten but this is primarily due to the action of one of the forces listed below, which is that force?

Answer 1

Our earth is formed Due to Gravitional extend,
When A vast Explosion formed ( Big Bang), At that time all planets with force Rotated and Revolved. At the same moment The inner part was very hot Bcoz of Frictional force

Answer 2

It has been found that the earth has an inner core that is solid and molten core by a Danish Seismologist Inge Lehmann. The inner core of the planet Earth is made up of iron and nickel alloy which is completely a solid where the outer layer is liquid that can be seen around the inner core.  

It has been estimated that the radius of the inner core is about 70 percentage of the moon surface which is 1,220 kilometers and the temperature is similar to the temperature of the surface of Sun which is 5,430 degree Celsius just because of the inter tectonic plates friction.

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