How can one tell if a reaction is a redox reaction? A. Spectator ions are present.
B. Elements change phases.
C. A precipitate is formed.
D. Electrons are gained and lost.
SUBMIT

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

1 is the answer to this problem

answer carbon and three oxygen atoms;