JOHN HARWOOD / SCIENCE PHOTO LIBRARY JOHN HARWOOD / SCIENCE PHOTO LIBRARY
Water drop impact. Computer illustration of a water drop impacting on a pool of water, showing secondary drop formation. After the water drop impacts to form a crater, the surface of the pool collapses with inward-rushing water colliding and rising to form a column. Along the column, water surface tension effects create secondary drops. Circular waves ripple out from the centre of impact.
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