HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Spring and summer wood growth. Light micrograph of a cross-section through a fir tree stem showing spring and summer wood (blue). The different growth rates and appearances of wood from season to season is used to study variation in growth rates. This is used in sciences such as climatology and dendrochronology (tree-ring dating). Magnification: x70 when printed at 10 centimetres across.
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