Edit thanks everyone, I’m not sure why I wasn’t understanding but you’ve all clarified it for me
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A rocket is just burning something fast and with a nozzle to direct the exhaust gases. Just like you can burn gasoline, and you can burn wood, the fuel you put in a rocket can be either liquid or solid. The other comments have gone in depth about the chemical compositions of exactly what you put in there and the advantages and disadvantages, but solid vs liquid fuel is like a propane grill vs a charcoal grill. You’re just changing what you burn.
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