Polar stratospheric clouds
A) absorb chlorine from atmospheric compounds.
B) are warmer than most tropospheric clouds.
C) are present only when the ozone hole is present.
D) consist only of water vapor.
E) are present year-round.
Question 2
The polar vortex
A) brings warm air poleward.
B) is located in the lower troposphere.
C) is caused by a temperature gradient.
D) consists of strong easterly winds.
E) all of the above
