What process is illustrated by the arrows in this image?
A) Longshore current
B) Rip current
C) Wave refraction
D) Beach nourishment
Answer: C
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A number of hydroelectric dams are now scheduled for dismantling. What is the main reason for this?
a. Their structure has weakened. b. New findings about the potential for large earthquakes have been discovered. c. Cheaper and cleaner sources of electrical power have been found. d. Environmental concerns must be addressed before a dam can be relicensed. e. The demand for irrigation water has decreased.
According to the International Union for Concerned Scientists in 2014, groups showing highest extinction risk are
A) cycads and conifers. B) birds, amphibians, and freshwater fish. C) corals and freshwater crabs. D) invasive species in general.
A set of station models on a surface weather map that reveal a sharp wind shift across a short distance and a marked changed in temperature and humidity indicate the presence of:
A) a thunderstorm. B) a geostrophic wind. C) a uniform air mass. D) a front.
18) The concentration of carbon dioxide in the atmosphere is ________
A) a small fraction of 1% B) approximately 10% C) approximately 30% D) approximately 50% E) approximately 75%