Author Question: Weather charts and maps are still plotted and analyzed entirely by hand. Indicate whether the ... (Read 99 times)

penza · **on:** Jul 13, 2018

Weather charts and maps are still plotted and analyzed entirely by hand.
Indicate whether the statement is true or false

Question 2

Primary air pollutants ____, whereas secondary pollutants _____.
A) enter the atmosphere directly; form by chemical actions involving other pollutants
B) form through a series of chemical reactions; occur naturally
C) occur naturally; are synthetic
D) enter the atmosphere directly; enter the atmosphere through human intervention