Tides are the regular rise and fall of the ocean along the coast. They a caused mai by t moon, wh gravity pu on t oceans a makes t water ri slightly tow it. Most coastal areas experience two high tides and two low tides every day. The difference between high and low water can be small or very large, depending on the shape of the coastline. People who fish or sail must therefore check tide tables before they go out.

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