I. Average carbon dioxide levels in the atmosphere today are the highest
they have ever been in Earth’s history.
II. Average global air temperatures today are the highest they have ever
been in Earth’s history.
III. The increases in average global air temperatures are equally distributed
across Earth’s surface.
(A) I only
(B) II only
(C) I and II
(D) III only
(E) All of these choices are false.
- One of the reasons why the vortex winds in the Antarctic are important in
the formation of the hole in the ozone layer is (A) they prevent warm,
ozone-rich air from mixing with cold, ozone-depleted air (B) they quickly
mix ozone-depleted air with ozone-rich air
(C) they harbor vast quantities of N 2 O
(D) they bring in moist, warm air, which accelerates the ozone-forming
process
(E) None of the above
- Although the Montreal Protocol curtailed production of ozone-depleting
substances, the peak concentration of chemicals in the stratosphere is only
now being reached. When do scientists expect a recovery in the ozone
levels in the stratosphere to occur?
(A) Immediately
(B) Within 5 years
(C) Within 20 years
(D) Within 50 years
(E) In about 100 years
- Over the past 1 million years of Earth’s history, the average trend in Earth’s
temperature would best be described as (A) very large fluctuations, from
periods of extreme heat to periods of extreme cold (B) very little change, if
any, fairly uniform and constant temperature
(C) a general cooling trend
(D) a general warming trend
