Scientists discovered that the inner core of earth is a solid. explain what evidence supports this thinking. be sure to include how pressure, temperature, and density play a role. plz include all 3: pressure, density, and temp

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun. 

Igot the answer, here you go dude. 

Wow thats alot but it would be the 3 one