Public domain photos

The image shows a piece of rock, likely a flint, next to a ruler on a white surface. The rock is a dark brown color and the ruler is a light gray color. The background is a bright white, providing a stark contrast to the dark rock.

The image shows a piece of rock, likely a flint, next to a ruler on a white surface. The rock is a dark brown color and the ruler is a light gray color. The background is a bright white, providing a stark contrast to the dark rock.Open in library