Scientists discovered that the inner core of Earth is a solid. Explain what evidence supports this thinking. Be sure to include how pressure, temperature, and density play a role.

Answer:

The inner core is a solid made out of heavy materials like iron and nickel. Even though the core is very hot, these materials do not melt very easily. As long as there is high pressure, the core can stay solid despite the temperature. Gravity pulls stronger on denser materials, denser materials are at the center of things, so therefore the middle of our earth is solid.

Explanation:

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The earth's inner core experiences a lot pressure and temperature due to the effect of geothermal gradient and overlying load level. With the temperature suggested to be about the temperature on the Sun's surface.

Using the principle of primary and secondary wave propagation, secondary S-waves cannot travel though liquid. However, secondary wave are able to propagate through the inner core of the earth, suggesting that the inner core isn't liquid.

Therefore, the inner core of the earth is solid using secondary wave velocity reading.

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