wind (windswell) and earthquakes
currents
whales humping
the disturbance in the medium generates waves
start off as ripples then gradually form into ocean waves.
i think for tidal power (Rotech Tidal turbine), inwitch the motion of the waves rotate the turbine. the turbine is connected to a generator witch generates power.
Waves is probably the most common.
a lake
Ocean waves created by energy in the water are the waves that can be found in the ocean.
the wind
Ocean waves.
turbine
generates carrier waves
The sudden flashes of light and trembling sound waves are involved in lightning and thunder. These waves are caused because of the Sudden electrical discharges resulting from atmospheric conditions.