Sound waves can help whales hear each other and communicate under water. Since the medium of these waves is water, the sound waves can travel much faster than humans talking on land. Medium is the main thing that can affect wave speed so whales are able to communicate quickly and other animals underwater also can too. Also, as the depth of the ocean increases as the whale goes further down the water gets colder which causes the speed to decrease. Temperature and pressure changing throughout the ocean can impact the sound waves of whales. A special case for these sound waves is the sound channel. the waves are able to travel thousands of miles and people have used technology to detect that they can hear sounds of whales many kilometers away in the ocean. Animals underwater must have a lot more fun communicating because the medium they are in!