Final answer:
Common elements found in wildland fires typically include evidence of chemical reactions such as the oxidation of materials and presence of ash containing various chemicals.
Step-by-step explanation:
The subject of the question is examining common elements found in wildland fires. The items listed, such as glass, bottles, lighters, and chemicals, are associated with human activity and potentially with the causes of these fires. However, if we focus on what is more commonly found as a result of wildland fires rather than as a cause, it's important to note that fires in natural settings can ignite due to various factors, including lightning strikes or spontaneous combustion of dry materials.
In terms of what may be left behind, evidence of chemical reactions, such as the oxidation of materials or the presence of ash containing various chemicals, is prevalent. Ultimately, the presence of certain elements or compounds, whether they are found naturally or because of anthropogenic reasons, heavily depends on the specific circumstances surrounding each individual wildland fire.