the use it by seeing how deep the ocean is so the echo will bounce back from the bottom of the ocean to the top
Echoes from the Ocean was created in 1999.
they probably would use a sonar which is a device that bounces sound waves off under water objects and then records the echoes of these sound waves. =]
SONAR
Yes they do.
to calculate the depth of the ocean floor
How scientists map the bottom of the ocean
michelle
SONAR
He could hear echoes throughout the mountain range.
DURR
Sonar uses echoes to locate objects by bouncing sound waves off them and detecting the echoes.
spiderman