The Earth's core is not a gas due to the immense pressure exerted by the overlying layers of the Earth, which prevents metals from transitioning into a gaseous state despite the high temperatures. This pressure is significantly higher than what is typically encountered in surface conditions, leading to a solid inner core primarily composed of iron and nickel, while the outer core remains liquid. The discussion highlights the critical role of pressure in determining the state of matter in the Earth's interior.
PREREQUISITESGeologists, physicists, students of Earth sciences, and anyone interested in understanding the composition and behavior of the Earth's core.