jesus waves
Density waves (they cause the spiral arms in disc galaxies).
When the water is disturbed, its molecules starts moving fast but do not loose their mean position and transfer this disturbance to other molecules and the waves are produced following this disturbance.
Since all such emissions are "black body radiation" (or pretty close), the correct answer is "light". All wavelengths... from the longest radio waves, to very energetic gamma radiation.
Waves can be produced by vibrations and electricity.
Because the universe as a whole is expanding, distant galaxies are moving away from us. As a result, electromagnetic waves emitted by those galaxies experience what is known as a red shift. Their wavelengths get longer.
seismic waves
How Electromagnetic Waves produced on surface of sun?
Seismic waves are produced by earthquakes
Seismic waves
There is literally no answer to this. Waves are produced by many different things. In the effort to salvage some kind of answerable question from this, most waves in the ocean are produced by wind.
earthquakes
sound waves