Cornish grit with ruler (right) indicating scale in millimetres. These small,rough stones range from three to five millimetres in length and are used in compost to improve drainage | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hart-Davis, Adam |
Bildgröße: | 4559 px × 3841 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |