Ice bubbles are formed in Mohe, the northernmost city of China in Heilongjiang as the cold winter drops to -30℃ in temperature. The special bubbles can be ignited since they are biogas (mainly methane) released by the plants at the lake bottom.#nature
pic.twitter.com/p8BkPozDVO

— Margaret Siegien (@MargaretSiegien) November 26, 2020