The Most Useful Way to Measure Seafloor Depth Is to ____

Multiple Choice

The most useful way to measure seafloor depth is to ____.

A) measure the time it takes for sound waves to travel from a ship to the seafloor and back
B) use an energy source to produce strong waves that will reflect from the seafloor and layers beneath the seafloor
C) use a very long line with a weight attached
D) make trips to the seafloor in modern submersibles
E) extrapolate depth from temperature and pressure changes