In August 1986, a gigantic volume of ________ belched forth from Lake Nyos in Cameroon and swept down the adjacent valleys asphyxiating 1,700 people.
A. carbon monoxide
B. super-heated H2O
C. carbon dioxide
D. hydrogen sulfide
E. sulfur dioxide
Answer: C
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Inner cities are often described by those who do not live within the city limits as having no "sense of place." How might inner city residents dispute this claim?
What will be an ideal response?
Shades of gray or green in iron-bearing rocks are caused by:
a. native iron b. ferric iron c. ferrous iron d. oxidized iron
If all of Earth’s water vapor were to suddenly condense and fall as rain, it would be enough to cover the entire globe with ____ of water.?
a. ?5 cm (2 inches) b. ?100 m c. ?2.5 cm (1 inch) d. ?1000 m e. ?10 cm (4 inches)
Construction of a dam results in
A. increased erosion by clear water released from the dam. B. an increase in the total amount of water flowing downstream of the dam. C. the dam releasing water that contains more sediment than carried by the river before the dam was constructed. D. increased erosion where the stream channel meets the reservoir.