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    { "id" : "http://dbpedia.org/resource/Metamorphic_rock"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means \"change in form\". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change." ] ,
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        "http://dbpedia.org/ontology/thumbnail" : [ "http://commons.wikimedia.org/wiki/Special:FilePath/Quartzite.jpg?width=300"] } } }
