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We know little about the centre of Earth. Geologists believed it had just one core – a hot mass of molten rock surrounded by a rock mantle. This is a ring between the earth's crust and core. The core is 2,900 km below Earth's surface. It has a radius of 3,485 km. Scientists believe there may be a second core. A geophysicist analyzed data from a 560-km-deep earthquake. It showed the possibility of a second core at the bottom of the mantle.
The geophysicist explained what intrigued her about Earth's core. She said: "There's still a lot we don't know about it. There's a lot more we can learn by using deep earthquakes." The geophysicist explained the importance of understanding more about the core. She said: "We want to know exactly how fast the mantle flows because that influences the evolution of the entire Earth. It affects how much heat the planet retains for how long."
Back to the earth's core lesson.