River research. Male hydrologist studying the flow rate of a river using a fluorescent dye. The time it takes the dye to reach each part of the river allows the river's speed to be calculated | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Goetgheluck, Pascal |
Taille de l’image : | 5059 px × 3436 px |
Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
Property Release : | Non requis |
Restrictions : | - |