Thread: Current weather
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Old 03-29-2009, 10:47 PM   #158 (permalink)
Richard
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Default Re: current weather

There are craters in the western US and elsewhere with one side composed of pumice grains, etc. glued together with volcanic "varnish". Over time this becomes the lower wall, with the remaining sides composed of iron and copper igneous slag. When the crater becomes full and breaches, the flow on the weak side is enough to tear out the already degraded varnish and a good portion of the lake drains.
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