Ice bubbles, Abraham Lake, at the foot of the Rocky Mountains in Canada. The rare phenomenon occurs each winter in the man-made lake, as the plants on the lake bed release methane gas, which freezes as it comes closer to the cold lake surface.
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Frozen bubbles in Canadian lakes - Methane gas bubbles underneath Vermillion Lakes in Banff National Park, Alberta, Canada. Normally the bubbles would break the surface but in low temperatures they freeze.