Annual growth rings. Cross-section through the trunk of a tree showing growth rings. Each ring represents the growth of the tree during one year. The circular shape between the rings is a knot,which marks the former postion of a branch | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Ackerley, Andrew |
Taille de l’image : | 5117 px × 3423 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |