National Geographic : 1953 Mar
+ Tiny Stars Gleam inaBallofIce Countless air bubbles were trapped within this transpar ent mass when the waters froze. Reflecting light, they shine like winking pinpoints in the Milky Way. The ice hangs suspended above the frost-covered floor of a deep moat. In the light of Gil berte's torch it shone an emerald green. + A Crystal Tongue Acts as Magnifying Glass Because of its transparency and variable curvature, this stalactite enlarges Maud's hand and watch. - At times cave explorers find eccentric calcite masses and crystals which branch out in all directions. These strange icicles follow a similar growth pattern, defying the law of gravity. In these shadowy halls the temperature never rises above freezing. It is possible that some of the ice was formed thousands of years ago.