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|What causes sound?
|Where do sound waves travel?
|In the air.
|What does sound waves have anything to do with energy?
|They carry energy.
|What makes an echoe?
|When sound waves hit a surface and bounce back to you.
|What is pitch?
|The highnesss or lowness of a sound.
|What is frequency?
|The number of times a second a sound wave repeats in a second.
|What is volume?
|The loudness or softness of a sound.
|What is amplitude?
|How high a note is.
|What is volume measured in?
|What causes sounds less than 0 decibels?
|Giant explosions or waves in the ocean.
|Why are scientists studying sounds less than 0 decibels?
|To predict when a volcano will erupt or when a tsunami is coming.