This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
EtnaDikes. en No Dikes at the base of the Serre del Solfizio Etna from Principles of geology being an attempt to explain the former changes of the earth's surface by reference to causes now in operation New York Public Library nypl org cfm trg strucID imageID total Lyell Charles Sir File EtnaDikes PDold Diagrams of dikes