Chapter 26, Problem 4TE

What is the evidence that Earth’s inner core is solid?

To determine

The evidence that the Earth’s inner core is solid.

Answer to Problem 4TE

In a solid material, there is only shear waves can exist that is the evidence of Earth’s inner core is solid.

Explanation of Solution

There is no direct method available to get to know about the Earth's core. The direct information can be taken from the seismic waves and the Earth's magnetic field.

The Earth's inner core is solid because it is made up of dense or heavy, materials. And these materials have a high melting point, so they cannot melt easily. They undergo high pressure exerted that it can only exist in the solid form.

In a solid material, there is only shear waves can exist. While in the liquid material, only the compressional wave can travel through. So, the Earth's inner core is made up of a solid core.

Conclusion:

Therefore, In a solid material, there is only shear waves can exist that is the evidence of Earth’s inner core is solid.