Bubbles in Nature

If we look around us, we can find natural bubbles in our environment. Show us some of the interesting examples which you have found and captured. It might be in volcanic rocks which have bubbled up from the fiery earth below, or bubbles left after waves have receded on the shoreline, or bubbles trapped in ice. In the macro world, you might have examples of insects blowing bubbles, or the bubbles encasing the eggs of insects, fish or amphibians, serving as insulation, moisturiser, and protection from predators. Macro and close-ups welcome. Size on longer side of your entry: 1,600px MAXIMUM.