Two caskets in a single grave, one on top of the other, is a double depth burial. This method allows two remains to be interred in one grave by stacking them in two layers, often to save space or for family preferences. The other terms describe different practices: direct burial involves interment (often with no viewing) without the need for an above-ground entombment or stacking; entombment places the body in a mausoleum or tomb above ground; home burial refers to burying on private property.

Cremation niches are small compartments designed to hold cremated remains, typically arranged in a columbarium or within a cemetery building such as a mausoleum. They can be located inside climate-controlled rooms in cemeteries, which provides a stable temperature and humidity, protecting the urns and inscriptions from weather, theft, and wear, while also making visitation and ongoing maintenance more predictable. This indoor, controlled placement is a common and practical arrangement, which is why it’s the most accurate statement. Other options miss the mark because niches aren’t restricted to outdoor placements, and they aren’t required to be stored in crypts. Crypts are a different type of burial chamber, and cremation niches are distinct from them.

The key document is the cremation authorization. This form is specifically used to give permission for cremation, either by the decedent in advance or by a legally authorized representative (such as next of kin) after death. It identifies the person and the requested disposition and may include any special instructions. This authorization is the formal permission that allows the funeral home to proceed with cremation and ensures compliance with laws and regulations, including proper chain of custody of the remains. The death certificate, while essential for recording the death, does not authorize cremation. A memorial invitation is for notifying people about the service, not for disposition of the remains. A cemetery plot deed concerns burial rights for a cemetery and is not applicable to cremation.

A burial vault is designed to give the grave structural integrity. Placed around the casket, it forms a rigid outer enclosure that distributes soil pressure and reduces ground settlement, helping to prevent the grave from collapsing during burial and as the grave settles over time. Although vaults may also keep moisture out and assist with handling, those are secondary benefits—the primary purpose is to maintain the stability and safety of the gravesite. Identifying the deceased and marking the location are achieved through records and grave markers, not the vault itself.