Old Faithful is now less predictable because of ________
A) earthquakes in the 1980s
B) lessening rainfall because of climate change
C) human changes to the landscape around the geyser
D) cooling of Yellowstone's underground magma chamber
E) the natural damming of the Firehole River
Answer: A
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Which of the following pairs includes concepts that are most closely associated to each other?
A) Biological wealth and introduced species B) Biological wealth and biodiversity C) Instrumental values and extinction D) Intrinsic value and instrumental value
By promoting mass transit, biking, and walking, the city of Portland, Oregon has saved its residents how much in transportation costs?
A. about $1 million B. more than $10 million C. about $100 million D. more than $1 billion E. about $10 billion
Scientists use ____ in natural settings to gather ecological data they need to evaluate the ecosystems in the United States.
A. remote sensing B. satellite data C. laboratory research D. mathematical models E. field research
Measured rates of sea-floor spreading range from ________ cm/year.
A. 1 to 24 B. 100 to 1000 C. 0.01 to 0.1 D. 0.1 to 1 E. 1000 to 10,000