A type of light wave

A mechanical wave that begins from a vibration

A chemical reaction

A form of electricity

A vacuum

A source of heat

A material (solid, liquid, or gas)

A magnetic field

Because sound waves are too weak

Because there is no material for them to vibrate

Because vacuums absorb all vibrations

Because sound waves are only audible in air

Liquid

Gas

Solid

Plasma

Because sound travels faster in water than in air

Because whales have special hearing abilities

Because water amplifies sound waves

Because the ocean has less noise pollution