Waves get sorted into groups far out in the ocean and when they hit the shore they are of similar sizes.

Question

Quizplus · Accepted Answer

This is because waves in the open ocean are affected by many factors such as wind speed, direction and distance over which the wind has blown. This causes waves of different sizes to be produced. However, as they travel over long distances, the larger waves move faster than the smaller ones and eventually group together forming "swell groups". These groups of waves have similar heights, periods and directions of travel, which is why they are of similar sizes when they hit the shore.

Waves Get Sorted into Groups Far Out in the Ocean