A tsunami is a series of waves generated by large undersea disturbances, such as earthquakes or volcanic eruptions. A tsunami ca
n exceed 100 km in wavelength, but measure about 3 m in height. However, as they near shallower water, the wavelength lessens and wave height increases, creating potentially devastating waves in coastal areas. Which of the following best describes the population dynamics in areas of the continental U.S. with the greatest tsunami hazard? A. Though values vary, the population only modestly increased (0-4.9%) between 2000 and 2010 throughout the areas with the greatest tsunami hazard.
B. Though population trends vary throughout the areas with the greatest tsunami hazard, overall there has been a net decrease in population.
C. The central Oregon coast has both the highest tsunami hazard and the highest population increase between 2000 and 2010.
D. The areas with the greatest tsunami risk correspond to areas that have had the greatest population decrease (-46.6% to -5%) from 2000 to 2010.
E. Some of the areas with the highest population increases between 2000 and 2010 (above 14.9%) occur in areas with the greatest tsunami risk.
E. Some of the areas with the highest population increases between 2000 and 2010 (above 14.9%) occur in areas with the greatest tsunami risk.
Explanation:
A Tsunami can also be called a tidal wave and is characterized by the displacement of a large volume of wave-shaped water capable of advancing in the terrestrial portion and causing great destruction. Although it does not happen very often, there are areas in the USA with high tsunami risks. These areas are the ones with the highest population growth, which can be a major concern for governments if they need to act against tsunamis.
The correct answer is B: The greater the angle of the fault, the greater the compression of the crust.
The most basic features to form in sedimentary basins under extension are normal faults. <em>Normal faults are generally fairly steep</em>, ie <em>have a high dip angle.</em> A fault will form in the crust when the extensional forces acting on it are great enough to cause failure along a fracture plane.
B is the best answer here because culture, nationality, history, and ethnicity are all directly tied to one's country (nation). Territory and boundary are not as specific, and state is too narrow.
