Human activity is changing the surface and temperature of the planet. But new research shows it is also changing the sound of the Earth’s oceans and seas. Scientists say the changes in the sounds of our oceans, seas, and other waterways affect many marine animals, from very small shrimp to huge whales. Sound travels "very far underwater,” Francis Juanes told the Associated Press. Juanes is an ecologist at the University of Victoria in Canada. He is also co-writer of the recent research published in the magazine, Science. “For fish,” he explained, “sound is probably a better way to sense their environment than light.” Sounds help fish and other marine animals survive. They use sounds to communicate with each other. Sounds also help some ocean animals find food and avoid their hunters.