What role do polar stratospheric clouds play in the formation of the Antarctic ozone hole?
What will be an ideal response?
Polar stratospheric clouds (PSCs) keep nitrogen from storing chlorine in a relatively inert form, thus releasing the chlorine to act as a catalyst. PSCs also provide a surface on which heterogeneous reactions can occur, which also releases more reactive chlorine into the stratosphere.
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Secondary succession ________
A) typically begins with lichen or moss colonizing rock B) is predictable because it always ends in the formation of a climax community C) occurs after a volcano spreads lava across a landscape D) occurs after a fire or flood E) requires primary succession to precede it
The Antarctic Treaty established that
A) states may establish research stations in Antarctica, but militaries are not permitted. B) countries can submit claims to Antarctica until 2009. C) Argentina, Chile, and the United Kingdom claimed portions of Antarctica. D) Russia and Argentina have claimed portions of Antarctica.
This soil from the southeastern United States is a(n)
A) Inceptisol.
B) Alfisol.
C) Aridisol.
D) Ultisol.
E) Mollisol.
A ________ is a bar graph that displays a country's population by age and gender
A) population pyramid B) population graph C) demographic transition D) demographic graph E) population ratio