Why does the speed of a sound wave increase as it moves into deep water?
a because sound waves travel faster as water temperature decreases, and water temperature decreases with depth.
b because sound waves travel faster in denser media, and water density increases with depth.
c because sound waves travel faster as salinity decreases, and salinity decreases with depth.
d because sound waves travel faster as the amount of phytoplankton decreases, and the amount of phytoplankton decreases with depth.