Which of the following nuclear equations correctly describes alpha emission?
A. 
Th ? 
Pa + 
e
B. 
Th ? 
Pa + 
e
C. 
Th ? 
e
D. 
Th ? 
Ac + 
e
E. none of the above
Answer: E
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a. Seamounts b. Hydrothermal vents c. Fracture zones d. Abyssal plains e. Abyssal hills
A hurricane will lose strength as it moves over land.
a. true b. false
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Fill in the blank(s) with correct word
Which of the following is false as regards the jet streams?
A) The polar jet stream and subtropical jet stream may appear over North America simultaneously. B) The polar jet stream can migrate as far south as Texas, steering colder air masses into North America. C) They weaken during each of the hemisphere's summer and strengthen during its winter. D) The pattern of ridges and troughs causes variations in jet stream speeds. E) They have no known effect on surface weather systems.