In the most general terms, the fact that a wave attains its maximum height when passing near the centre of a group accounts for the familiar periodic appearance of an extra large wave.
Kwezona zibizo jikelele, isenzo sokuba amaza angaphuphumela kubukhulu bobude xa kugqithela kufutshane nomphakathi okwityala ngokufana nexeshana lembonakalo lamaza amakhulu ongeziweyo.