Circles and Numbers

By 511044s014934

Holes in the Stone

I picked up this stone on the beach about a month ago, but I took a photo of it just now.
Why do these holes occur ?

67 views
  • 11
  • 0
  • Sony ILCE-5100
  • 1/161
  • f/4.0
  • 30mm
  • 1600

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