The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
(From NASA. This is a rendering of an ocean ridge, copied from http://earthobservatory.nasa.gov/Study/Tectonics/tectonics_3 . Since this is a NASA site, the image is public domain. {{PD}} Source: English Wikipedia, original upload 1 May 20)
File links
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):