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
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If coal is composed of organic materials such as vegetation, what prevents them from decaying before they become a sedimentary rock?
What will be an ideal response?
Which of the following best describes a scientific theory?
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.
The forces operating at continent-continent convergent boundaries are ____.
a. transpressional b. compressional c. tensional d. lateral shearing e. compressional and tensional
Productivity in polar oceans is ________
A) light-limited B) nutrient-limited C) oxygen-limited D) light- and nutrient-limited E) nutrient- and oxygen-limited