The ash produced from coal-fired plants is
A) non-toxic and useful in paving roads and producing cement-like products.
B) voluminous, highly toxic and needs special impoundment technology.
C) currently released slowly into rivers, lakes, and oceans.
D) concentrated into pellets and used for fuel.
B
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In toxicology studies, the threshold level of a chemical is the dose of the chemical ________
A) above which at least 50% of the organisms being tested died B) below which there is a measurable decline in the health of the organism being tested C) below which at least 50% of the organisms being tested died D) above which there is a measurable decline in the health of the organism being tested
Which of the following is most likely a basic economic activity?
A) video rental store B) grocery store C) gas station D) steel mill E) travel agency
The slow, subsurface cooling of magma into various types of intrusive igneous rock masses is called ____
a. pahoehoe b. pyroclastic c. plutonism d. effusive eruption e. volcanism
If a carbon atom is a stereocenter, which of the following statements must be true about that carbon?
A) It has four single bonds. B) It has a double bond and two single bonds. C) It has two double bonds. D) Any of these bonding arrangements can be associated with a stereocenter.