The sea is polluted in different ways. Sometimes, things are dumped or split right into it. Waste and chemicals are also washed into it from homes, factories and farms. The water people use in their homes gets dirty. Sewers carry much of this waste water away. Many factories get rid of their waste in a similar way. Most of this waste water ends up in rivers, lakes and oceans. If it is not cleaned first, it can pollute the water. Fertilizers and other agricultural chemicals are sprayed on crops. When they are washed into rivers by rain, they reach the sea and pollute it. Offshore oil rigs pump up oil from beneath the seabed. Sometimes, oil leaks into the ocean from these operations and pollutes the sea. Oil tankers are another cause of water pollution . If one of these ships has an accident, it can crack open and split oil into the water. How we can help? Our modern need for
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