Which of the following is the most accurate description of the principle of a lightning rod?
a. the lightning rod acts to discharge the thunderstorm
b. the lightning rod intercepts the lightning and safely carries the lightning current
around the object it protects
c. lightning rods have been used since the 1700s, but the principle of their
operation is not known.
d. positive charge induced in the lightning rod repels the negative charge in an
approaching step leader
b
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Complete the following nuclear equation:
Tl ? 
Pb + ??
A. 
e
B. gamma ray
C. 
He
D. both A and B
E. none of the above
AIDS is currently the biggest killer worldwide among communicable diseases
Indicate whether the statement is true or false.
How does seafloor spreading explain the movement of the continents? What will be an ideal response?
A flood crest
A. usually increases downstream from the area covered by the rain storm. B. is the maximum stage of the river at any point along the stream from a flood event. C. is when a stream overflows its normal flow channel and spills out onto the floodplain. D. can take years to travel from its initiation point to the mouth of a river.