Water depths and seafloor topography are now routinely determined by ________.
A. ship-mounted, optical-fiber satellite uplink systems
B. computerized, satellite-mounted, parallel transponder systems
C. ship-mounted echo sounders
D. by satellite-linked, laser reflector systems
Answer:C
Water depths and seafloor topography are now routinely determined by ________.
A. ship-mounted, optical-fiber satellite uplink systems B. computerized, satellite-mounted, parallel transponder systems C. ship-mounted echo sounders D. by satellite-linked, laser reflector systems