What is the process of getting rid of burnt out modules of the rocket once its propellant has been consumed called?

What is the process of getting rid of burnt out modules of the rocket once its propellant has been consumed called? Correct Answer Staging

In case of multi-stage rockets, once the propellant of a stage has been consumed it is removed. This helps in reducing the structural mass resulting in a larger exhaust velocity.

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Hybrid rocket engines are also called as ________ propellant rocket engines.