Public domain photos

The image shows a close up of a rock with a small hole in it, which appears to be a sponge. The sponge is a light brown color and has a smooth, glossy texture. It is surrounded by a few small holes, which are likely used to hold the sponge in place.

The image shows a close up of a rock with a small hole in it, which appears to be a sponge. The sponge is a light brown color and has a smooth, glossy texture. It is surrounded by a few small holes, which are likely used to hold the sponge in place.Open in library