Tides, They make the sea level go up and down during the day., Spring, This tide happens when the Moon, the Earth and the Sun are in a straight line., Neap, This tide happens when the Moon and the Sun are pulling in different directions., Wind, Waves are caused by this., Tsunamis, They are big, strong and dangerous waves., Natural, These causes are events that humans can't control, like a volcano eruption., Water pollution, It is the effect of harmful and toxic waste and chemicals in water.

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