HFCs and HCFCs are ____. (Multiple Choice)

HFCs and HCFCs are ____.
 A) the primary components of photochemical smog
  B) replacements for CFCs
  C) clean-burning fossil fuels
  D) cancer-causing chemicals produced by automobiles

Question 2

Earth's atmospheric pressure always ____________________ with increasing height.
 Fill in the blank(s) with correct word

Question 3

What are two commonly used terms for a computer-derived forecast map?

Question 4

Which chemical destroys ozone in the stratosphere?
 A) carbon monoxide
  B) chlorine
  C) sulfur dioxide
  D) nitric acid

Question 5

Plant photosynthesis increased the concentration of ____________________ in Earth's early atmosphere.
 Fill in the blank(s) with correct word

Question 6

What is a set of mathematical equations that approximates how atmospheric temperature, pressure, winds, and moisture vary with time?