The Earth's core is not a gas because of its high temperature and pressure. The extreme conditions at the core of the Earth cause the materials to exist in a dense and solid state, rather than as a gas.
The temperature of the Earth's core is estimated to be around 5,400 degrees Celsius. This high temperature is due to the heat generated by the decay of radioactive elements and the residual heat from the formation of the Earth.
The Earth's core maintains its high temperature through a process called convection. This is when the hot materials at the core rise and the cooler materials sink, creating a continuous cycle of heat transfer.
No, it is highly unlikely that the Earth's core will turn into a gas in the future. The high pressure and density at the core are necessary to maintain its solid state, and it would require a significant decrease in temperature and pressure for it to become a gas.
If the Earth's core did turn into a gas, it would have catastrophic effects on the entire planet. The loss of the dense and solid core would weaken the Earth's magnetic field, making it more vulnerable to solar winds and radiation. This would also have a significant impact on the Earth's climate and atmosphere.