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.
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The moon’s gravity pulls water toward it.
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Water on the side near the moon bulges up.
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Water on the far side also bulges due to inertia.
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Earth rotates once every 24 hours.
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Most coasts see two high tides and two low tides daily.
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The sun also affects tides, but less than the moon.
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Biggest tides happen during full and new moons.