Large regions of the Sun's chromospheres rise and fall vertically.These are called supergranules,and the boundaries of supergranules are marked by:

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Quizplus · Accepted Answer

The boundaries of supergranules are marked by spicules, which are thin, spiky features that protrude vertically from the chromosphere. Vents are not directly related to supergranules, and sunspots are regions with strong magnetic fields, which do not necessarily coincide with supergranule boundaries. Granules, on the other hand, are smaller convective cells that populate the chromosphere and the photosphere, but they are not the same as supergranules.

Large Regions of the Sun's Chromospheres Rise and Fall Vertically