十万个为什么·科学阅读30篇（3）
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What Causes Tides?
潮汐是怎么产生的？
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Tides are the rise and fall of ocean water.潮汐是海水的涨落。
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The moon’s gravity pulls water toward it.月球引力将海水拉向自身。
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Water on the side near the moon bulges up.靠近月球一侧的海水隆起。
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Water on the far side also bulges due to inertia.远离月球一侧的海水因惯性也隆起。
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Earth rotates once every 24 hours.地球每24小时自转一圈。
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Most coasts see two high tides and two low tides daily.多数海岸每天经历两次高潮和两次低潮。
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The sun also affects tides, but less than the moon.太阳也影响潮汐，但作用小于月球。
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Biggest tides happen during full and new moons.满月和新月时潮差最大。