Air pollution can cause a decrease in what?
The atmosphere kinetic energy smoke crop yields nutrients Temperature fires smog
A B C D E F G H
Research has shown that soil pH less than 6.0 can decrease crop yields.
Air pollution can cause a decrease in crop yields. 
Air pollution can cause a decrease in what? (A) The atmosphere (B) kinetic energy (C) smoke (D) crop yields (E) nutrients (F) Temperature (G) fires (H) smog