Although hydroelectric dams generate electricity without producing greenhouse gases, they ________
A) are short-lived structures that have to be rebuilt about every 20 years
B) alter water control in ways that make it more difficult to irrigate crops
C) contribute only about 5% of the electrical power throughout the world
D) eliminate farmland, wildlife habitats, and sometimes even villages in regions that are flooded
E) still produce more greenhouse gases per unit of electricity produced than coal power plants
D
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The aquatic ecosystems that show the highest net primary productivity are ____________________
Fill in the blanks with correct word
Individuals add carbon dioxide to the atmosphere directly and indirectly based on their lifestyle choices. This is called a carbon ____.
A. trail B. footprint C. stamp D. fingerprint E. track
The climate associated with a small area at or near Earth's surface is:
a. microclimate. b. base climate. c. mesoclimate. d. boundary climate.
Which of the following coasts is an example of a semidiurnal tidal pattern?
A) Gulf of Mexico B) Pacific coast of Asia C) Southwest Coast of South America D) West Coast of Africa E) West Coast of The United States