What process continues in massive stars after core hydrogen fusion ceases, creating heavier elements?

Answer

Helium fusion into carbon and oxygen

When core hydrogen is depleted, the star contracts, heats up, and begins fusing the resultant helium into heavier elements, chiefly carbon and oxygen.

What process continues in massive stars after core hydrogen fusion ceases, creating heavier elements?
Elementastronomystarsupernovanucleosynthesis