Enhanced oil recovery methods include all of the following except
A. heating the oil to decrease its viscosity.
B. use of gas under pressure to force out more oil.
C. deliberate fracturing to increase reservoir porosity.
D. underground mining of oil-bearing rock.
Answer: D
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The total ecological footprint for humanity is expected to be
a. twice the planet's ecological capacity by the year 2015 b. 30% higher than the planet's ecological capacity by the year 2035 c. 60% higher than the planet's ecological capacity by the year 2035 d. 30% higher than the planet's ecological capacity by the year 2015 e. twice the planet's ecological capacity by the year 2035
A fault zone that is known for a lot of big and small earthquakes goes suddenly quiet for 10 years. This quiet period in an otherwise active fault zone is called a seismic gap
Explain why seismic gaps are pretty good indicators that an area may soon have a moderate or large earthquake. (Hint: Think of strain in rocks.)
Large families in poor countries
A) are rare, because having many children is expensive. B) are common, due largely because of low infant and childhood mortality. C) are common, in part because more children means more labor. D) are becoming more common as the use of modern agriculture increases.
In which of the following climates would vegetation be least likely to develop drought resistant characteristics?
a. low latitude desert b. humid continental, hot summer c. tropical savanna d. Mediterranean