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Conceptest: Ozone umbrella analogy part of Library:ConcepTests:Examples
Which statement is the best analogy? A. An umbrella is to rain as the stratosphere is to solar radiation. B. An umbrella is to rain as the stratosphere is to ultraviolet radiation. C. An umbrella is to rain as the ...

Conceptest: CFCs and ozone part of Library:ConcepTests:Examples
Analyze the following student descriptions of the relationship between CFCs and ozone. Which is the best? a. CFCs are manufactured gases that destroy the ozone layer and produce oxygen. b. Chlorine forms from the ...