Why is productivity low in tropical regions?
A) because the deep waters are too warm to maintain a healthy biomass
B) because the thermocline acts as a barrier to the mixing of surface and deep waters
C) because there is too much sunlight
D) because the low density of the water makes it hard for plankton to float near the surface
E) All of the above are problems.
B
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Which of the following statements about the Greenland and Antarctic ice sheets is false?
a. The volume of the world’s ice in the Greenland and Antarctic ice sheets is much greater than the cumulative volume of the world’s ice stored in mountain glaciers. b. The Greenland and Antarctic ice sheets together contain about 90% of the world’s freshwater. c. If 20% of the water in the Greenland and Antarctic ice sheets were to melt sea level would rise by over 6 meters (20 ft). d. The Greenland and West Antarctica ice sheets are both losing ice at the rate of about 150 million cubic kilometers per year. e. The Greenland ice sheet is a remnant of the continental glaciers of the last Ice Age.
The permafrost areas of Russia are one of the few areas that would not be affected by global warming due to the cold conditions that prevail yearlong at this high latitude
Indicate whether the statement is true or false
Which of the following is a type of speleothem?
a. column b. uvala c. tower karst d. swallow hole
An area with desert conditions in the United States is ________.
A. Minnesota B. the Pacific Northwest coast C. the Sahara D. the Colorado Plateau E. the southern Appalachians