Peroxyacetyl nitrates (PANs) in the lower troposphere A) are ...

[jon_i]

Peroxyacetyl nitrates (PANs) in the lower troposphere
 
  A) are principally related to sulfur dioxides.
  B) are formed by particulates such as dust, dirt, soot, and ash.
  C) damages and kills plant tissue but does not appear to affect people.
  D) are emitted from the tail pipes of automobiles; i.e., it comes directly from automobile exhaust.

Question 2

Which of the following is now an erosional feature formed by an alpine glacier?
 
  A) cirque
  B) horn
  C) drumlin
  D) col

[maaaaaaaaaa]

Answer to Question 1

C

Answer to Question 2

C

[jon_i]

Wow, this really help

[patma1981]

Thanks for the timely response, appreciate it