One crack… and the earth lights up. This can happen when flammable gas (like methane or other natural gases) escapes through fractures in the ground. If it meets a spark or high heat, it can ignite, and the flame travels along the crack while hot air and steam rise like smoke. Sometimes a similar look also comes from volcanic heat opening fissures and releasing hot gases. You’ll hear about events like this near oil & gas fields, landfills, or active volcanic zones...places like Azerbaijan (known