Sample of chalk. Chalk is a form of soft sedimentary carbonate rock formed from the shells of microscopic marine organisms called coccolithophores | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 4200 px × 4200 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |