How many parts of the rocket break off as it leaves The earths atmosphere?

As a rocket ascends through the Earth's atmosphere, several components may detach at different stages. Typically, during launch, the solid rocket boosters (if present) are jettisoned after their fuel is expended. Additionally, the first stage of the rocket usually separates from the second stage once its fuel is depleted, and in some multi-stage rockets, additional stages can also break away. However, the exact number of components that break off depends on the specific rocket design and mission configuration.