Greenhouse gases include all of the following except ____.
a. argon
b. methane
c. nitrogen oxides
d. carbon dioxide
e. hydrofluorocarbons
Question 2
How are tree rings used as proxy data to provide an indirect record of past climate conditions?
a. Tree rings are thicker and the wood is denser when growing conditions are better.
b. Tree rings are thicker and the wood is lighter when growing conditions are better.
c. Tree rings are thinner and the wood is denser when growing conditions are better.
d. Tree rings are thinner and the wood is lighter when growing conditions are better.
e. Because of variable moisture levels, tree rings cannot be used as proxy data.
The Greenhouse Effect in a Car
(a) The relative age ranges of different dating techniques depend upon the half-life of the system u
Nitrogen trioxide
Pathogenic microorganisms include (A) bacteria, (B) viruses, (C) protozoa, and (D) helminths.
Variable Gases: Ozone
Projections of global temperature depend heavily on the level of future greenhouse gas emissions