| http://www.w3.org/ns/prov#value | - d signed another six-month extension on an option on the Potter Township site about 35 miles north of Pittsburgh.The companies had signed a six-month extension at the end of last year for the site.The so-called cracker plant would convert natural-gas liquids from the Marcellus Shale into more profitable chemicals such as ethylene, which is used to make plastics, antifreeze and other products.
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