Public domain photos

The image shows a close up of a small white rock on a black background with text at the top and bottom of the image. The rock appears to be a sporozoan, a type of small, round, white substance with a slightly bumpy texture.

The image shows a close up of a small white rock on a black background with text at the top and bottom of the image. The rock appears to be a sporozoan, a type of small, round, white substance with a slightly bumpy texture.Open in library