Question

which bathymetric technique differentiates between multiple layers of the ocean bottom? seismic reflection radar altimetry sounding sonar

Explanation:

Seismic reflection works by sending seismic waves into the ocean bottom. These waves reflect off different layers (due to differences in density, composition etc.). By analyzing the reflected waves, multiple layers can be differentiated. Radar altimetry mainly measures sea - surface height. Sounding (like echo - sounding) gives depth to the ocean floor but not detailed layer information. Sonar (like side - scan sonar) gives images of the ocean floor surface but not internal layers.

Answer:

seismic reflection