The Earth's Inner Core
Finally, we would reach the Earth’s inner core. The inner core is about 900 miles inward towards the center of the Earth. It is believed that this inner core is a solid ball of mostly iron, and nickel. The inner core is the hottest of all! Scientist's believe that it's around 7000 degrees celsius! But they're not totally sure.
Watch 0:16 - 0:38 to find awesome facts about the Earth's Inner Core!