Multiple Choice
How were water depths and seafloor bathymetry (submarine topography) determined by the Challenger surveys?
A) by early deep sea divers
B) multi- beam, towed echo sounders
C) timing the descent of heavy bricks with sand glasses and listening for the echoes with early hydrophones
D) hand thrown and retrieved weighted lead- lines
Correct Answer:
Verified
Correct Answer:
Verified
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