white <a href="//commons.wikimedia.org/wiki/Volcanic_rock" class="mw-redirect" title="Volcanic rock">volcanic rock</a> at Sarakiniko; Milos island, greece, own work, Sep 2006
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Thpanagos" title="User:Thpanagos">Thpanagos</a> assumed (based on copyright claims).
CC BY 2.5
No machine-readable source provided. Own work assumed (based on copyright claims).