The Inner Core of the Earth can get up to 9,800 degree Fahrenheit which is more than 3 times hotter than lava in this volcano. It is also located under the Outer Core. But people usually say that it is under the mantle.
The pressure in the Inner Core is also 330 to 360 gigapascals. It will feel like you have 47,700 elephants on your head, which is over 300,000 tons
It is mostly made of Iron and Nickel but there are small amounts of other elements like gold. It is also around 1,200 kilometers thick.