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Sound is caused when vibrations cause air to vibrate which causes sound waves which are picked up be your eardrum causing it to vibrate which is translated by your brain into a sound.
Sound needs something to travel on, for example a solid, a liquid or a gas.
Sound travels in air at about 1,224 km per second.
Sound travels in water at about 5,400 km per second. That means sound travels much faster through a liquid than through air.
Sound travels even faster through water. A sound can travel about one mile in five seconds in water.
An echo happens when a sound bounces off a surface and bounces back to you.
A large vibration causes a large sound and a small vibration causes a small sound.
Soft materials such as cotton wool absorb sound.
Indians used vibrations to track buffalo. They would put their ears to the ground to try and hear the buffalo.
Sound in Water.
Sound travels faster through water than through air. This helps animals such as whales to communicate or talk with each other over very long distances.
Whales also use sound waves to help them travel through dark water. They send and receive sound waves in the same kind of way as the sonar on a ship or submarine.
To find out more about the way that animals use sound, please click here!