Silver sand with a ruler (right) indicating scale in millmetres. Silver sand is a very fine sand with a neutral pH that is used in compost for seeds to encourage drainage | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hart-Davis, Adam |
Bildgröße: | 4596 px × 3812 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |