十万个为什么·科学阅读30篇（5）
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How Do Tides Rise and Fall Every Day?
潮汐为什么会每天涨落？
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The Moon’s gravity pulls Earth’s oceans toward it.月球引力将地球海洋拉向自身。
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Water bulges on the side of Earth closest to the Moon.地球靠近月球一侧的海水隆起。
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Another bulge forms on the opposite side due to Earth’s spin.地球自转导致另一侧也形成隆起。
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Earth rotates once every 24 hours under these two bulges.地球每24小时在这两个隆起下自转一周。
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Most places get two high tides and two low tides daily.多数地区每天经历两次涨潮和两次退潮。
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The Sun also affects tides, but less strongly than the Moon.太阳也影响潮汐，但作用弱于月球。
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Tide height changes with Moon phases and coastline shape.潮高随月相和海岸线形状而变化。
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Scientists use tide charts to predict safe boating times.科学家利用潮汐表预测安全航行时间。