Don’t worry about big bro if you are in HighSchool and just do the work even though you are miserable you will thank yourself till the day you die because those 4 years decide what your whole life will be like just do the best you can so you have a job that pays well and your happy instead of slacking and being miserable
I think it is Racial background
Mantle. Beneath the crust is the mantle, which is also mostly solid rocks and minerals