THE WORD "IT" IN BOLD IN PARAGRAPH 2 REFERS TO .A.THE MANTL...
21.
The word "It" in bold in paragraph 2 refers to .A.
The mantleB.
The crustC.
The EarthD.
The core21.
The word "It" in bold in paragraph 2 refers to .A.
The mantleB.
The crustC.
The EarthD.
The core