Ice Bubbles

I noticed a plantpot saucer I had left outside had what appeared to be interesting thin ice crystals in the frozen water,



Just the subject for another session with the LCD microscope







This time I remembered that the pixel size for photographs needs setting every time the microscope is switched on.

On further thought these appear to be air bubbles frozen in the ice. The bubbles form as air which is dissolved in the water is released as the temperature drops and gets surrounded by frozen water.