JOHN HESELTINE / SCIENCE PHOTO LIBRARY JOHN HESELTINE / SCIENCE PHOTO LIBRARY
Beach. View of a pebble and sand beach. The pebbles lie near the back of the beach and are gradually worn down to form sand. Water erosion and the pebbles rubbing against each other as they are moved by wave action, leads to their smooth and rounded shapes. Photographed in Pembrokeshire in Wales.
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