The oxidation of iron to rust is a problem structural engineers need to be concerned about, but the oxidation of aluminum to aluminum oxide is not. Why?
A) Since aluminum is so light and inexpensive, it is easily replaced when corroded.
B) Aluminum oxide is insoluble in water and thus forms a protective coating that prevents continued oxidation of the aluminum.
C) Aluminum oxide is even stronger than aluminum.
D) The oxidation of aluminum is a very slow reaction, taking hundreds of years before any structural changes are noticed.
B
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The areas within the United States where humans have contributed the most sulfur to the atmosphere are generally near
A) nuclear power plants. B) coal-fired power plants. C) cement factories. D) hydroelectric plants.
Skin damage resulting from exposure to the Sun is cumulative; i.e., the skin never completely heals from previous sunburns
Indicate whether the statement is true or false
Waves moving against a current will ________.
A. decrease their speed B. increase their height C. shorten their wavelength D. All of these are correct. E. None of these is correct.
Earth's mantle is exposed on the ocean floor in great slabs of rock between widely-spaced volcanoes in ________
A) deep-ocean trenches B) oceanic ridges C) oceanic rises D) ultra-slow spreading centers E) volcanic arcs