Public domain photos

The image shows a box of rocks sitting on top of a table next to a ruler. The box is filled with stones and there is a paper with a QR code on it placed on the surface. The ruler is used to measure the size of the rocks.

The image shows a box of rocks sitting on top of a table next to a ruler. The box is filled with stones and there is a paper with a QR code on it placed on the surface. The ruler is used to measure the size of the rocks.Open in library