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Little is about the geology of the very centre of Earth. It was our planet had just one core – a scorching hot mass of molten rock and gas by a solid, rock mantle. The mantle is a ring between the earth's crust and core. The core is 2,900 kilometres below Earth's surface. It a radius of around 3,485 kilometres. Scientists from the University of Chicago have that there may be a second core deep below our feet. Research has geophysicist Dr Sunyoung Park to there is another core. She data from a 560-km-deep earthquake. Her calculations the possibility of a second core, consisting of a layer of fluid rock, at the bottom of the mantle.

After Dr Park the deep earthquake, she about why she found the Earth's core so intriguing. She said: "Even though the mantle makes up the largest part of Earth, there's still a lot we don't about it." She added: "There's a lot more we can by using deep earthquakes as a way to these questions." Ms Park explained the importance of understanding more about the centre of our planet. She said: "We want to know exactly how fast the mantle because that influences the evolution of the entire Earth. It how much heat the planet retains for how long, and how the Earth's materials are over time. Our current understanding very limited and a lot of assumptions."