Ocean Racket.If you ever thought of an ocean swim as a quiet escape, think again. Today, oceans are noisier than a motorcycle without a muffler muffler, in automobiles, device designed to reduce the noise from the exhaust of an internal-combustion engine. When the exhaust gases from an internal-combustion engine are released directly into the atmosphere, they create a loud noise, caused by the passage of the . Boat propellers, deep-sea drills, and sonar--sound waves that ships bounce off ocean floors to map them--often blast sounds as loud as 170 decibels. That's 10,000 times louder than the most deafening rock concert. And that's set off alarm bells for scientists concerned about undersea life. They worry that exploding ocean noise may confuse and even kill animals that use sound to find food and mates.
"Marine mammals marine mammals
mammals inhabiting the sea; generally taken to include the cetaceans (whales, porpoise, dolphin), the sirenians (sea-cows, including manatees and dugong) and the pinnipeds (the carnivores of the group, seals, sealions, walruses). like dolphins and whales use sound like humans use sight," says Roger Gentry, oceanographer (ocean scientist) for the National Marine Fisheries Service The U.S. National Marine Fisheries Service (NMFS) is a United States federal agency. A division of the National Oceanic and Atmospheric Administration (NOAA) and the Department of Commerce, NMFS is responsible for the stewardship and management of the nation's living marine in Silver Spring, Maryland Not to be confused with Silver Springs.
Silver Spring is an urbanized, unincorporated area in Montgomery County, Maryland, USA. After Baltimore and Columbia, Silver Spring is the third most populous Census Designated Place in Maryland. . "If they can't hear, they could die." Whales, for example, communicate within their own group or pod through sounds as high as 20,000 hertz--the same frequency as most of today's ocean racket.
Also, sound travels four times faster in water than in air: 1,230 meters per second versus 340 meters per second-- because water molecules are packed tighter than air molecules. So underwater sound Underwater sound
The production, propagation, reflection, scattering, and reception of sound in seawater. The sea covers approximately 75% of the Earth's surface. travels longer distances before it diminishes. A dolphin swimming along the California coast may be able to hear deep-sea drilling 7,000 miles (11,300 kilometers) away off the China coast! Researchers have no concrete data on how ocean noise pollution will impact sea life. But they do know such noise is definitely not music to fish ears!