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.
I have a general avoidance policy towards plastic, particularly disposable plastic. I seek less toxic alternatives to plastics whenever I can. But I make an extra special effort to avoid certain plastics, including polyvinyl chloride (PVC), also known as vinyl or the #3 plastic.The Center for Health, Environment and Justice (CHEJ) calls PVC  the most toxic plastic for childrenâs health and the environment .. Vinyl is the least recyclable plastic because of the diversity of additives used to make different types of PVC products. 2  In addition, when PVC-products are accidentally mixed with non-chlorine plastics, they contaminate the entire recycling process.