The three-cell model for general circulation:
A) includes a segment called the Hadley Cell.
B) is a better representation of the atmosphere than the single-cell model.
C) accounts for the positioning of the Polar and Subtropical jet streams.
D) takes in to account the spin of the earth.
E) all of the above
Answer: E
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Which of the following describes why hydrothermal vein and disseminated deposits are important to society?
A. are the primary source of water-based minerals such as gypsum B. easy to mine because they are found in aquifer materials C. source of valuable metals such as copper, lead, and gold D. sometimes contain diamonds E. are the primary source of pure sulfur
In the 19th and early 20th centuries many people came to Arizona for what?
A) It was believed that the dry air improved their health. B) Collecting discarded Native American relics. C) Interest in the "Cowboy Lifestyle" as depicted by dime novels. D) The influx of European immigrants to the East drove many settlers west to escape "corrupting influences".
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.
Ice cores record both the record of past temperatures, and also the causes of climate change
a. true b. false