6ebbba77_Marine_habitats__principles__Living_in_the_sea
[Factor] Hearing [Living on the land] Sound is produced by vibrations of hard objects. These vibrations are transferred to a soft, compressible medium (air) and in order to be heard, transferred to a hard medium (the ear mechanism). In the process, much energy is lost. [Living in the sea] 
Sound or vibrations are transferred from a hard object to an incompressible (hard) medium (the water) to arrive at a hard receptor. Very little energy is wasted this way. Sound travels four times faster in the sea. Waves can easily travel thousands of km. The sea is full of loud vibrations and noises but the human ear is not designed to hear these well.
Marine habitats, principles
Living in the sea