| http://www.w3.org/ns/prov#value | - Copper compounds often give off a blue or green light when burnt so that could be one source of contamination giving the green colours.posted by Mitheral at 10:59 AM on May 13, 2011 Because the grid is a grid rather than a tree when a couple transformers serving the same area blow the additional load on adjacent transformers can cause them to overload and blow to leading to a cascade.
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