Question

Acid rain can be attributed to which of the following factors?
P) human alteration of global S cycle
Q) human alteration of global N cycle
R) increased average global temperature
S) natural causes such as fluctuation in sunspots
T) natural causes such as volcanism
(A) P, Q and R (B) P and R
(C) S and T (D) P, Q, and T

Answer 1

natural causes such as volcanism and fluctuation in sunspots

Answer 2

acid rain caused by chemical reaction