A pyre (; ), also known as a funeral pyre, is a structure, usually made of wood, for burning a body as part of a funeral rite or execution. As a form of cremation, a body is placed upon or under the pyre, which is then set on fire. In discussing ancient Greek religion, "pyre" (the normal Greek word for fire anglicized) is also used for the sacred fires at altars, on which parts of the animal sacrifice were burnt as an offering to the deity. Pyres are crafted using wood. The composition of a pyre may be determined through use of charcoal analysis. Charcoal analysis helps to predict composition of the fuel and local forestry of the charcoal being studied. Specifically, in the Bronze Age, pyre materials were gathered based on local abundance and ease of access to the wood although materials were also selected due to the specific properties, potential traditional purpose, or due to economical reasons. In Templenoe, pyres typically consisted of oak and fruit wood compositions. From analyzing three necropolises, in Kokotów, Pawłowice and Korytnica, it seems that Polish pyres consisted of primarily Scots pine, birch, and oak trees, as pines, birch, and oak were dense in local woodlands. All parts of the tree were used including the trunk, branches, twigs, and even pine cones. During World War II, pyres were used in German death camps on Polish territory, such as Treblinka. Worked antler and bone objects, along with flint and flake tools, and copper-alloys are most commonly found in pyre cremation remains. The copper-alloys leave a blue-green stain and are typically fused to the ribs, arms, and other areas where jewelry is commonly worn. A study was done on the bone fragments of cremations to show that not only will movement of the bone fragments cause breakage but also environmental factors play a part. After studying cremation remains in urns that had been tightly sealed and had no evidence of environmental disturbance it was found that on average bigger bone fragment sizes were observed meaning less bone breakage had occurred.