Physical pollution is the most obvious type. Solid, liquid, and dissolved materials that harm marine organisms or halter marine ecosystems are included in physical pollution. There are different types of reasons of how water pollution is caused. Farmers spray their crops with a chemical called pesticide to kill insects. The chemicals can seep into groundwater.
Oil well blowouts, tanker spills, and inland disposal of oil are some human sources that contaminate the ocean. About half of the oil that contaminates the ocean is caused by human sources. People dump food, paper cups, paper, plastic, aluminum foil, glass, and even bikes into oceans, rivers, and ponds. Factories dump huge amounts of waste into rivers and oceans.
