Both are electromagnetic waves.
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they start at a earthquake.
there are none
The basic similarities between light and sound include the idea that both move in waves. They have frequency, or wavelength (as they are inverses of each other). They also have speeds of propagation that vary according to the materials through which are propagating.
Echoes of sound and images in a mirror involves sound waves and light waves respectively being reflected off a surface.
False. For some bands of radio waves the atmosphere is transparent. Radio waves can penetrate to the ground. That's why we have radio telescopes on the Earth.