When a current-carrying wire is bent into a loop, the magnetic field inside the loop
A. becomes concentrated.
B. cancels.
C. weakens.
D. none of the above
Answer: A
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Along a reverse fault, the________ wall moves down ward relative to the ________ wall
A) foot; hanging B) hanging; foot C) foot; normal D) hanging; reverse
Air pollution is
A) a form of photochemical smog. B) gaseous sulfur and phosphorus. C) a concentration of a trace substance at a level greater than occurs in average air. D) a concentration of a trace substance at a level greater than one percent. E) concentrated in tropical regions.
Which of the following statements is an expression of climate?
A) Tomorrow's high is forecasted to be 67°F. B) February is the wettest month in Los Angeles, CA, with an average rainfall of 3.92 inches. C) Big Rapids, MI, recorded six inches of snowfall today. D) Tornado warnings are in effect for Oklahoma City, OK.
The estimated number of planets in the Milky Way is ________ with some ________ in habitable zones
A) 25 million; 3 million B) 1 million; 1 (Earth) C) 300 billion; 125 billion D) 1 billion; 25 million E) 100 billion; 500 million