Coloured scanning electron micrograph (SEM) of Coal from the ship Titanic. Coal is a fossil fuel (combustible sedimentary rock) that forms when dead plant matter is converted into peat. Over time geological processes convert peat into lignite, then sub-bituminous coal, then bituminous coal, and finally anthracite. Magnification: x535 when shortest axis printed at 25 millimetres. | |
Licence : | Libre de droits |
Crédit: | Science Photo Library / DENNIS KUNKEL MICROSCOPY |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |