This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Mantle had no subdivision. it had only one portion.
if you are referring  to core( core is  divided into two parts inner and outer core)

(see the image below)