潮
水大
 |  水乾 |
潮，學術上又叫潮汐，係指海面水漲水落嘅現象，原因係地球受到太陽同月球嘅萬有引力（叫潮汐力）影響。水漲時叫水大或者潮漲；水落時叫水乾或者潮退。
大潮
當太陽、月光、地球依此次序排成一線（新月），由於太陽同月球嘅引力喺同一方向拉，海水會升得特別高。當月球、地球同太陽三者依此次序連成一線時（望月/滿月），情況一樣，就係大潮。大潮時引起嘅浪，叫大潮浪。
攷
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