What happens to a person between his death and the Day of Qiyamaat is called “Barzakh” which literally means screen and fence.
Since dead bodies are generally buried, the term, “Grave” is generally used for all. Hence even those persons who are cremated or drown remain alive in Barzakh. In reality reward and punishment are related and connected to the soul, and Allaah Ta’aala has the definite power of granting reward and punishment by collecting even the burnt particles and molecules.
by Mufti Afzal Hoosen Elias (damat barkatuhum ‘aliyah)