Lingering in a long line at the dry cleaners, a woman starts to feel dizzy and tired with a quickly developing headache. Someone suggests that her symptoms might be from breathing something used in the shop

A substance that can cause such symptoms, and is commonly used in dry cleaning, is a A) heavy metal.
B) halogenated hydrocarbon, PERC.
C) radioactive hydrocarbon.
D) safe and gentle natural compound.


B

Environmental & Atmospheric Sciences

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What will be an ideal response?

Environmental & Atmospheric Sciences

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A) It is just one of many ways of looking at things. B) It is a point of view which cannot be challenged. C) It is a widely accepted explanation of some phenomena supported by a large amount of experimental data and is therefore definitely correct. D) It is a widely accepted explanation of some phenomena supported by a large amount of experimental data, but it can be shown to be incorrect by a single experiment which yields results which contradict it.

Environmental & Atmospheric Sciences