Algae on a pond surface in the Pocono Mountains,Pennsylvania,in spring. This can be a natural process,or it can be caused by an increase in nutrients from fertilizers and detergents | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gadomski, Michael P. |
Taille de l’image : | 3404 px × 5135 px |
Model Release : | Non requis |
Restrictions : |
|