Describe an example to illustrate the disastrous effects of large scale freshwater transfer projects in dry areas.
What will be an ideal response?
The Aral sea water transfer project clearly illustrates the disastrous effects of large scale water transfers. Diverting massive amounts of freshwater inputs for irrigation resulted in 90% loss of water volume in the Aral Sea, increased salinity in sea water and disruption of ecosystems. The effects were exacerbated by high evaporation rates and drought in the area.
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Nitrates often used for gunpowders, explosives, and fertilizers (when combined with positive ions such as potassium, sodium, and calcium) have the chemical formula
A) N2. B) N2O. C) NO2. D) NO
If gradient were the only factor controlling the erosive power of these streams, what should happen to the position of the mesa edge with time?
The following questions are based on Figure 39-4, a section of USGS “Dane Canyon, Arizona” quadrangle below, showing the southern edge of the Mogollon Mesa (34°24'33"N, 111°10'52"W), formed by a nearly flat-lying layer of resistant rock (you can view this map in color by going to the Lab Manual website or by scanning the QR code for this exercise).
Chemical weathering generally proceeds ________.
A. fastest in the intact interior of a rock body, where ions easily move short distances from grain to grain B. along contacts between mineral grains C. fastest on flat joint (crack) faces that are distant from any corners or edges D. fastest at the tip of growing cracks deep within the rock E. at about the same rate throughout a rock body
Which of the following nations in Latin America is a global leader in ecotourism?
A) Mexico B) Costa Rica C) Argentina D) Peru E) El Salvador