Science & TechFact

Beneath your feet it's as hot as the Sun's surface.

Earth's inner core is a ball of solid iron and nickel with a radius of about 1,220 kilometers. Its temperature is around 5,400 °C, close to the Sun's surface at roughly 5,500 °C. It stays solid anyway because pressure of 330 gigapascals, three million atmospheres, squeezes the metal together.

Useful: The heat is left over from Earth's formation plus radioactive decay; it powers plate tectonics and the magnetic field.

Source: en.wikipedia.org

ErdeGeologie Physik

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