This is a file from the Wikimedia Commons and may be used by other projects. Information from its description page there is shown below. Commons is a freely licensed media file repository.
Summary
DescriptionLava Flows at Hengifoss in Iceland.jpg
English: Lava flows in the cliff of Hengifoss waterfall in Iceland.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Die Fallhöhe des Hengifoss beträgt 118 m. Im Kessel dieses Wasserfalls wechseln schmale, leuchtendrote Tonstreifen in regelmäßiger Abfolge mit harten Basaltserien. In den Sedimenten unter dem Wasserfall findet sich Sandstein mit sogenannten Surtarbrandur-Flözen aus verkohlten Pflanzenresten.