THE WORD "IT" IN BOLD IN PARAGRAPH 2 REFERS TO .A.THE CRUST...
40.
The word "It" in bold in paragraph 2 refers to .A.
The crustB.
The EarthC.
The mantleD.
The core40.
The word "It" in bold in paragraph 2 refers to .A.
The crustB.
The EarthC.
The mantleD.
The core