What is the inner core of earth?
It is solid. The inner core of the Earth, its innermost layer as detected by seismological studies, is a primarily solid sphere about 1,220 km (758 mi) in radius, only about 70% that of the Moon. It is believed to consist of an iron-nickel alloy, and it may be hotter than the Sun’s surface. Based on the abundance of chemical elements in the solar system, their physical properties, and other chemical constraints regarding the remainder of Earth’s volume, the inner core is believed to be composed primarily of a nickel-iron alloy, with very small amounts of some other elements.
