HOW IS A COAL OCCURED ?
COALS ARE OCCURED BY THE LAYERS ,WHICH WERE CONSTITUTED AT SWAMPS BY THE PLANTS,
ARE EXPOSED TO BIG CHANGES.THESE LAYERS HAVE BEEN BURIED IN DEPTHS BY THE EARTH'S MOVEMENTS
AND ACCUMULATION OF PRECIPITATES ON THEM.THE SUBJECT BURIED PLANTS TURN INTO A COAL HAVING
CHEMICALLY AND PHYSICALLY CHANGINGS WHEN THEY ARE EXPOSED TO A RISING HEAR AND PRESSURE
IN THEIR STRUCTURES.THIS PROSESS MATERIALIZES IN MILLION YEARS AND THE COALS ARE CLASSIFIED
INTO CLASSES ACCORDING TO THEIR ORGANIC MATURITY SUCH AS LIGNITE,SUB-BITUMENED,COAL,
BITUMENED COAL AND ANTRASITE.
LIGNITE AND PARTLY SUB-BITUMINOUS COAL ARE USUALLY SOFT,BREAKABLE AND LUSTERLESS.THE MAIN
CHARASTERISTICS OF THESE COALS ARE HIGHER HUMUDITY AND LOWER CARBON THEY CONTAIN.
ANTRASITE AND BITUMINOUS COAL ARE USUALLY RIGID AND SHINY.RELATIVELY,THEY HAVE LOWER
HUMUDITY AND HIGHER CARBON.AND THEIR GEOLOGIC LIFETIMES CHANGE BETWEEN 400 AND 15 MILLION
YEARS.THE AGED COAL ARE USUALLY HIGHER IN QUALITY.
|
| 05.09.2010 |
| USA $ |
| Purchase | 1.4994 TL |
| Selling | 1.5066 TL |
| EURO (€) |
| Purchase | 1.9241 TL |
| Selling | 1.9334 TL |
|
