For the fulfilment of his requirements and selfishness, man has put so many effluents in the water that the quality of marine water has been spoilt. This is called marine pollution. In simple words, because of human and natural factors, the changes in the nature and quality of water which is harmful to both humans and other living beings is called marine pollution. In the ahead of this article, we will discuss the causes of marine pollution and effects of marine pollution.Most Highlighted 6 Causes of Marine PollutionThere are various factors responsible for marine pollution. They are as follows:1. Waste of Coastal TownsThe sea coast touches vast areas of the world. Thousands and thousands of towns and settlements are situated on sea coasts. The picture taken from the sky shows that the sea's water near any city is darker than in other areas.Thus releasing huge amounts of excreta and garbage into the sea. The ash, dirty water, dirt and dust produced while cleaning the machines, oil and grease, and industrial effluents pollute the marine water.2. Polluted Water of RiversThousands of rivers fall into the ocean. If their water is tested on their places of origin, it will be found clear and pure, but if we test the water on their edges and further on, it can be called very dangerous, and a healthy person cannot have it for more than three months.So, these rivers clearly pour a great quantity of polluted water into the seas. On the single Ganga river, about 114 major cities have a population of about 50 thousand each. So this river pours all its effluents and sewage into the sea.3. Oil Pollution75% of the world's oil is drilled from the sea bed; during this process, a thousand litres of oil mix in seawater. Some of it mixes in seawater while filling or emptying the tankers etc. Also, the oil wells in the sea leak continuously. Oil in seawater affects sensitive flora and fauna.