Provenance (geology) Provenance (geology) Provenance in geology, is the reconstruction of the origin of sediments. The Earth is a dynamic planet, and all rocks are subject to transition between the three main rock types: sedimentary, metamorphic, and igneous rocks (the rock cycle). Rocks exposed to the surface are sooner or later broken down into sediments. Sediments are expected to be able to provide evidence of the erosion history of their parent source rocks. The purpose of provenance study is to restore the tectonic, paleo-geographic and paleo-climatic history. In the modern geological lexicon, "sediment provenance" specifically refers to the application of compositional analyses
Artwork damaged or destroyed in the September 11 attacks Artwork damaged or destroyed in the September 11 attacks An estimated $110 million of art was lost in the September 11 attacks: $100 million in private art and $10 million in public art. The attacks were said to be "the biggest single disaster ever to affect the [art] industry". The Port Authority held an estimated 100 pieces of art work at the World Trade Center Complex, in addition to the seven public works of art that had been created for the World Trade Center, all of which were destroyed or severely damaged. An estimated $10 million worth of public art