What was the most contentious aspect of this compromise?

Of all the bills that made up the Compromise of 1850, the Fugitive Slave Act was the most controversial. It required citizens to assist in the recovery of fugitive slaves.
^ what zok said !! 100% correct

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.