A Hole in the Sky
16-Jan-2004
David Whitehouse writes in bbcnews.com that a giant hole
appeared in a layer of clouds in Mobile, Alabama, caused by
changes in atmospheric temperatures due to global warming.
The hole formed when the contrails from a passing plane
froze and fell through a cloud, causing the water droplets
inside it to evaporate. The warmer lower atmosphere has
made the upper atmosphere cooler, which causes contrails to
freeze, sometimes crashing to the Earth as mysterious
blocks of
ice. To see the "sky hole"
click
here.
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