SEEKING LIGHT?

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SEEKING LIGHT?Get a CANDLE AND PHosPHorus.PHOSPHORUS. In 1669 the German alchemist Hennig Brand discovered thechemical element known as PHosPHorus. The element got its name fromthe Greek phosphoros, meaning "light bearing," because in the dark andin moist air it can be seen to glow with a dull white light.For a time early scientists thought that phosphorus might be thesource of the light emitted by fireflies and certain other creatures.It is not. The firefly's light, however, as well as that given off bymany minerals, resembles the light emitted by phosphorus. Hence allsuch light is commonly called phosphorescence.Phosphoric acid, a compound of hydrogen, oxygen, and phosphorus(H3PO4); forms phosphate salts . Aug. 18, 1998--Dead Zone Diminished But Running Deep Scientists have reported that the 1998 occurrence of the Gulf ofMexico's dead zone--a large area of

oxygen-deprived water that appearsin the northern gulf every summer--was smaller than previous years,though it was also deeper. The zone is usually concentrated off theeastern and central Louisiana coast. The 1998 zone measured some 4,800square miles (12,400 square kilometers), down from the previous fiveyears, when the zone covered as much as 7,000 square miles (18,130square kilometers), extending from the Mississippi River to thecoastline of Texas. Although the zone is a normal phenomenon, scientists believe theincrease in its size during the late 20th century was an indirectresult of the heavy influx of nutrients such as nitrogen andphosphorus from fertilizer runoff. Phosphor (or Phosphorus), name given by Greeks to morning star; sameas Roman Lucifer; in Greek mythology, the son of Eos (Aurora); atfirst considered to be same as Hesper, the evening star; laterbelieved to be his brother.

 

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