Multiple Choice
The Challenger expedition (1872-1876) was a unique and historic voyage. Why?
A) It is the longest continuous oceanographic expedition on record.
B) Its scientists developed the first reliable navigational charts to indicate current and wind patterns.
C) It was the first expedition to use an echo sounder to study the seafloor.
D) It proved the hypothesis that life could not exist in the deep sea.
Correct Answer:

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Correct Answer:
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