In industrialized nations, the two most deadly sources of indoor pollution are ________
A) pesticides and cigarette smoke
B) radiation from electronic equipment and pesticides
C) pesticides and cleaning agents
D) radon and cigarette smoke
E) synthetic furniture materials and radiation from electronic equipment
Answer: D
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Suppose you deflate a bicycle tire by depressing the air valve. Why does air rush out of the tire? After the air stops rushing out of the tire, is the tire empty? Explain your answer.
What will be an ideal response?
The concentration factor of an ore is a measure of its enrichment in a metal of interest, relative to average crustal rock.
Answer the following statement true (T) or false (F)
If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the mass of the ocean is 1.5 × 1018 tons, how much gold is in the ocean?
A) 3.0 × 1012 kg B) 3.0 kg C) 300 g D) 36 mg E) 3,000 lb
What happens to the density of air with increasing elevation in the atmosphere?
A. It decreases B. It stays the same C. It increases