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In the Arctic frost flowers, a strange phenomenon where frost grows from imperfections in the surface ice amid extreme sub-zero temperatures nearing -22C or -7.6F, forming spiky structures that have been found to house microorganisms. In fact, the bacteria found in the frost flowers is much more dense than in the frozen water below it, meaning each flower is essentially a temporary ecosystem

from the Guardian

Frozen bubbles in Canadian lakes - in pictures

Frozen bubbles in Canadian lakes - in pictures Photographed in Banff National Park in Alberta, Canada, the bubbles are made from highly flammable gas methane

Submerged tree in the Green Lake. The Green Lake or Grüner See is a lake in Austria that dries out almost completely during fall, is used as a county park in the winter and is famous for the underwater park which forms during the spring due to the snow meltdown.