These bubbles are made of methane gas. You see, methane bubbles are small pockets of methane gas trapped in or rising through water, mud, or ice. In warmer places, they rise through water or mud. In cold regions, these bubbles get trapped in ice, forming stunning layers of frozen discs. And yes, they’re flammable! They typically form when organic matter (like dead plants or animals) breaks down in low-oxygen environments like the ocean floors. Bacteria from decomposing plant matter at the bottom