What Based on seismographic testing the inner core is believed to be .?

Based on seismographic testing, the Earth's inner core is believed to be a solid sphere composed primarily of iron and nickel. It is situated approximately 3,200 kilometers (about 2,000 miles) beneath the Earth's surface and has a temperature that can reach up to 5,700 degrees Celsius (about 10,300 degrees Fahrenheit). The inner core is characterized by extremely high pressure, which keeps its material in a solid state despite the high temperatures.