Which of the following human activities has resulted in the conversion of nearly 50% of the Earth's land surface?
A) Construction of roads and bridges
B) Construction of all homes and buildings
C) Agricultural production of crop and animal products
D) Construction and operation of mines
C
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The U.S. EPA estimates that recycling and composting in the United States in 2010 reduced emissions of climate-changing carbon dioxide by an amount roughly equal to that emitted by 36 million ____.
A. hydraulically fractured gas wells B. barrels of oil C. tons of coal D. passenger vehicles E. power plants
If a country is experiencing a negative net migration rate, then
A) more people are leaving the country than moving to it. B) more people are moving to the country than leaving it. C) a negative net migration rate does not tell us anything. D) more people are dying in the country than are being born. E) the number of people leaving the country is equal to the number moving there.
Streams can lengthen their drainage courses by the process of headward erosion
a. True b. False Indicate whether the statement is true or false
The Eltanin Fault is an example of ________ plate boundary
A) a continental transform B) a continental-continental convergent C) an oceanic transform D) an oceanic-continental convergent E) an oceanic-oceanic convergent