In which area have trees been seriously affected by U.S.air pollution?
A) in the Sierra Nevada Mountains
B) in the Rocky Mountains
C) in the Olympic Mountains
D) in the Canadian Shield

Question

In which area have trees been seriously affected by U.S.air pollution? 
A) in the Sierra Nevada Mountains 
B) in the Rocky Mountains 
C) in the Olympic Mountains 
D) in the Canadian Shield

Quizplus · Accepted Answer

The Answer of In which area have trees been seriously affected by U.S.air pollution? 
A) in the Sierra Nevada Mountains 
B) in the Rocky Mountains 
C) in the Olympic Mountains 
D) in the Canadian Shield

In Which Area Have Trees Been Seriously Affected by U