What proportion of urban Americans lives in central cities?
A. one-tenth
B. one-quarter
C. one-third
D. one-half
E. two-thirds
Answer: C
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To safeguard against groundwater contamination, sanitary landfills are ________
A) covered with cement B) lined with an impermeable liner C) located on slopes so water runs downhill D) located on industrial sites where groundwater is not used for drinking or agriculture
The single largest sand mining operation is in Alaska
Indicate whether the statement is true or false
Which of the following has been cited as a positive feedback loop involving the thawing of permafrost?
A) Thawing of permafrost will release vast amounts of carbon to the atmosphere, accelerating warming. B) Thawing of permafrost will increase albedo, leading to more warming. C) Thawing of permafrost will contribute to sea level rise, which will further reduce overall global albedo values. D) Thawing of permafrost will inhibit frost wedging action on large boulders, altering absorption ability.
Which of the following is true of the chemical composition of seawater?
A) The highest salinity values of seawater are found near landmasses and at higher latitudes. B) The chemical properties of seawater show very little latitudinal variability, though some minor variability with depth. C) Eighteen elements account for 75% of the dissolved matter in seawater. D) Samples of ancient seawater suggest a great deal of chemical variation over the Earth's history. E) Seawater contains dissolved gases, suspended and dissolved organic matter, and many trace elements.