9
 What might happen if acidic chemicals were emitted into
 the air by factories? Choose the best answer.
 A
 The acid would destroy metallic elements in the air
 B
 The acid would be neutralized by bases within clouds
 C
 Acid rain might destroy ecosystems and farmland
 D
 Violent chemical reactions would take place within the
 atmosphere
 co search
 O
 BI