The is the thickest layer of the earth. question 4 options: a) crust b) mantle c) lithosphere d) inner core

THE ANSWER I THE MANTLE

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. 

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