How does the action of a mine fire cause explosive gases to be formed?

The formation of explosive gases during a mine fire primarily occurs through the distillation of combustible gases from coal and various chemical reactions. When coal is subjected to high temperatures, it undergoes a process called pyrolysis, which breaks down the coal and releases volatile compounds, including methane and other hydrocarbons. These gases can accumulate in confined spaces, creating a highly flammable and potentially explosive atmosphere.

In addition to distillation, chemical reactions may also occur as a result of the intense heat from the fire. For example, combustion reactions consume oxygen and produce carbon dioxide and water vapor, but they can also lead to the release of other gases depending on the materials present. The combination of these factors makes the environment in a mine fire particularly hazardous due to the potential for gas accumulation and subsequent explosions if ignited.

While other options may reference potential ignition sources or physical disruptions, they do not capture the primary chemical processes leading to explosive gas formation in the context of a mine fire.