However, there is no consensus among volcanologists on how to define an active volcano. As of 2012, PHIVOLCS lists 23 volcanoes as active in the Philippines, 21 of which have historical eruptions; one, Cabalian, which is strongly fumarolic volcano [further explanation needed]; and one, Leonard Kniaseff, which was active 1,800 years ago (C14).
Polyvinyl Chloride PVC. Polyvinyl Chloride (PVC) is a major plastics material which finds widespread use in building, transport, packaging, electrical/electronic and healthcare applications.
PVC decking. PVC decking is composed entirely of Polyvinyl chloride (PVC) and contains no wood. PVC decking is a more expensive option in the decking industry, but it provides significant fade and stain resistance and lower maintenance requirements compared to other products. Contents.