What is the purpose of a grave liner?

A grave liner serves a critical purpose in the burial process by providing protection for the casket and ensuring the integrity of the burial site. The primary function of a grave liner is to create a supportive structure around the casket, which helps to prevent the ground above from settling and potentially causing a depression or collapse in the grave. This structural support is essential not only for the physical stability of the burial site but also for maintaining the overall appearance of the cemetery, as a well-maintained grave is important for the dignity of the interment.

Additionally, grave liners can offer some protection against environmental factors (such as water and soil erosion) that may compromise the casket over time. While other options may address various aspects related to graves, they do not specifically highlight the fundamental role of maintaining the casket's integrity and the physical condition of the burial area like the correct choice does.