Originally Posted by Nida Sehar

I got the answer. There's a typo in the question
Differenciated means that Earth Interior has layers and its not uniform from crust uptill core, in case somebody is still wondering

But now I have another question
Discuss the significance of the “Dee Double Prime” layer in the view of the fact that the Earth is a differential Planet.

Perhaps this time Syeda Sabahat might want to add something. Aapi please meri madad karo!!