Question

5.
To all those places my teacher...but which he never knew.
What does the speaker mean by 'know' in this line?​

Answer 1

mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.