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A Natural Resource:Pearls

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Thomasina Glenn

on 5 December 2012

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Transcript of A Natural Resource:Pearls

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli Pearls; A Natural
Resource My natural resource is pearls Pearls have been crushed and used in cosmetics, medicines, and in paint formulations. Pearls can also be used to make jewelry. This includes earrings, bracelets, and necklaces. Pearls have been used for medicinal purposes, ranging from aphrodisiacs to cures for insanity. In China, pearls have been crushed and used in cosmetic powder for over 2000 years. They are believed to have anti-aging properties. They are also used to stitch into clothing. The oyster's mantle tissue secretes the two main components of nacre: thin layers of the mineral aragoniteand a gluelike substance called conchiolin, which cements the layers together. Because the aragonite is translucent, light interacts with the overlapping layers to give the finished pearl its lustrous appearance. Pearl molluscs also coat the inside of their own shells with nacre, so some shells picked up at a seashore are shiny and iridescent inside. Pearls come from a group of water organisms called pearl molluscs, which includes oysters, mussels, and clams from both freshwater and saltwater. The pearl itself actually begins as an irritant. Sand, a pebble, or a pesky parasitic organism gets inside the oyster's shell. To reduce the irritation, the oyster coats the intruder with layers of a solid, slick material called nacre. Fresh water pearls can take between one to six years to develop. Pearls used to be harvested by divers. However, it is a dangerous occupation and natural pearls of high quality are rare. People have now learned to farm pearl molluscs specifically to produce cultured pearls. This means as long as there are pearl molluscs there will be pearls. It is renewable resource. a It is made by pearl molluscs. Is it a renewable resource? Pearls are not a fossil fuel. Pearls are made over
1-6 years. Pearls are not made over millions of years. Fossil fuels are things made over millions of years. Are pearls
fossil fuel? oriental pearls. (n.d.). Retrieved from orientalpearls.net pearl-guide. (n.d.). Retrieved from pearl-guide.com REFERENCES Newtons apple. (2012). Retrieved from tpt.org Pearl Farms
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