THE SCIENCE EXPLORER SERIES《ENERGY》LEVEL 1 ~ THE WITCH KEEPS A BIRD

THE SCIENCE EXPLORER SERIES《ENERGY》LEVEL 1 ~ THE WITCH KEEPS A BIRD
Our voice is produced by the vibrations of the vocal cords.
Animals use sounds for detecting danger, navigation, hunting and communication.
Sound is formed from waves. Sound waves in the air ricochet when they are obstructed thus forming echoes.

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