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Layer C formed.
Layer B formed.
Layer A formed.
When layers A-B-C were present, intrusion D formed.
Intrusion D cut through layers A-C.
Fault E formed, shifting rocks A through C and intrusion D.

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.