It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
This image was acquired from
Keywords from Image Description:
Inspecting spreading avens on rock face. en br Image title Inspecting spreading avens on rock face Image from Public domain images website publicdomainimage html publicdomainimage Peeples Gary Fish and Wildlife Service Not given Transferred by on This file is in public domain not copyrighted no rights reserved free for any
Page 2017 Free-images.com. All images are Public Domain