Sound waves are molecules bumping against each other. If you push on the rod you are causing the molecules to transmit force down the rod, ie sound waves.
They were present in the dust cloud that the sun and the planets coalesced from. Except for the primodial elements, hydrogen, helium and lithium, they were created by nuclear reactions in supernovas, which broadcast them throughout space and seefed the dust clouds. The primordial elements were created by nuclear reactions at the time of the Big Bang.
If you're using a fusion explosion its far more likely to be propelling atomized dust up into the air, rather than rock. There's no way to moderate a fusion explosion.
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