十万个为什么·科学阅读30篇(6)
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How Do Tides Change Twice Every Day?
潮汐为什么每天变化两次?
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The Moon’s gravity pulls ocean water toward it most strongly.月球引力对海洋水体的拉力在靠近月球的一侧最强。
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Water bulges on the side of Earth nearest the Moon.地球靠近月球一侧的海水隆起形成涨潮。
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A second bulge forms on the opposite side due to inertia.由于惯性,地球另一侧也形成一个隆起。
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As Earth rotates, any coast passes through both bulges daily.地球自转时,任一海岸每天都会经过这两个隆起区域。
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High tide happens about every 12 hours and 25 minutes.高潮约每12小时25分钟出现一次。
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Low tide occurs halfway between two high tides.低潮出现在两次高潮之间的中间时刻。
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Sun gravity adds or reduces effect depending on Moon phase.太阳引力会根据月相增强或减弱潮汐效应。
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Tide charts help sailors, fishers, and coastal builders plan safely.潮汐表帮助航海员、渔民和沿海建设者安全规划。