What does a total fertility rate of 2.1 indicate?
A) that a population is at its replacement rate
B) that a population has reached its peak
C) that a population is growing quickly
D) that a population is growing slowly
E) A TFR that is less than 2.1 has no particular significance.
A) that a population is at its replacement rate
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Warmer temperatures resulting from climate change have increased the devastation of large areas of conifer pine forests in the western areas of Canada and the United States due to ____.
A. the pine bark beetle B. wildfires C. drought D. gypsy moths E. aphids
The most effective coastal erosion is accomplished by ________
A) wind B) abrasion C) hydraulic pounding D) compressed air E) chemical action
Why does only a small fraction of the energy at one level of the food chain become available to the next level of the food chain?
What will be an ideal response?
Methane, nitrous oxide, and halocarbons
A) are not as potent as carbon dioxide and water vapor. B) exert a negative radiative forcing effect in the atmosphere. C) are all potent greenhouse gases but at present are less of a threat for climate change than carbon dioxide. D) are removed from the atmosphere as fast as they enter and pose no threat of climate change.