What features did Dr. Ballard not encounter during his National Geographic exploration to the midocean
ridge?
a. the rift valley
b. faults and fractures
c. lava flow
d. tube worms
ANS: D
Dr. Ballard traveled 9100 ft in Alvin to observe the structure of a mid-ocean ridge including the rift
valley, fissures, cracks, and faults, and lava flows. Information can be found in the section Insight
from A National Geographic Explorer: Dr. Ballard recounts an expedition to a mid-ocean ridge.
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