Which force may cause uplift, folding, and formation of reverse and thrust faults?
A) slab pull
B) gravity
C) compression
D) tension
Answer: C
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The air that a scuba diver breathes is pressurized to counteract the pressure exerted by the surrounding water. Under these conditions, excessive amounts of nitrogen dissolves in bodily fluids, such as blood. If the diver ascends to the surface too rapidly, the excessive nitrogen bubbles out of the bodily fluids-much like carbon dioxide bubbles out of a soda immediately after it has been opened. This results in a painful and potentially lethal medical condition known as the bends. Why does breathing a mixture of helium and oxygen rather than air help divers to avoid getting the bends?
A. The helium is less soluble in the bodily fluids and so less dissolves for a given pressure. Upon decompression, there is less helium to "bubble out" and cause potential harm. B. Helium is a smaller molecule than nitrogen, so when it bubbles out of solution, it is less painful and less harmful to the body. C. The nitrogen in the blood will bind to helium and so will be exhaled rather than being stuck in the blood. D. Oxygen and helium have stronger attractions for each other than they do for the blood, so less helium will be dissolved in the blood and to cause the bends.
The batholiths that make up the Sierra Nevada, and mountains in southern California, Idaho and the
Coast Range were the result of subduction during the Cordilleran orogeny. Indicate whether the statement is true or false.
The eutrophication that has taken place in Chesapeake Bay, the Gulf of Mexico, and other locations appears to be due to ________
A) weather alone, because it is only obvious in the summer B) pesticide use along the waterways C) excess nutrients from fertilizers D) global warming from human use of fossil fuels E) heavy metals dumped in the sewage
Darwin suggested that the mechanism by which evolution proceeds is ____________________. Fill in the blank(s) with the appropriate word(s)