what are the causes of marine pollution?
Human activities, Industrial outflows and sewage contribute heavy metals, pesticides, PCBs, disinfectants, household cleaning products and other synthetic chemicals
Sea

Much floating plastic rubbish does not biodegrade, instead disintegrating over time and eventually breaking down to the molecular level. Rigid plastics may float for years. In the centre of the Pacific gyre there is a permanent floating accumulation of mostly plastic waste and there is a similar garbage patch in the Atlantic. Foraging sea birds such as the albatross and petrel may mistake debris for food, and accumulate indigestible plastic in their digestive systems. Turtles and whales have been found with plastic bags and fishing line in their stomachs. Microplastics may sink, threatening filter feeders on the seabed.

Most oil pollution in the sea comes from cities and industry. Oil is dangerous for marine animals. It can clog the feathers of sea birds, reducing their insulating effect and the birds' buoyancy, and be ingested when they preen themselves in an attempt to remove the contaminant. Marine mammals are less seriously affected but may be chilled through the removal of their
which of the following is not generally a factor in wave generation in the open ocean UNANSWERABLE what is the definition of 'sea'? The sea, the world ocean, or simply the ocean is the connected body of salty water that covers over 70% of Earth's surface. what is meant by 'seawater'? It is water in the sea a characteristic of seawater is that it is salty. how do waves form? Wind blowing over the surface of a body of water forms waves that are perpendicular to the direction of the wind. and tsunamis? It is an unusual form of wave caused by an infrequent powerful event such as an underwater earthquake or landslide, a meteorite impact, a volcanic eruption or a collapse of land into the sea. what affects currents? The sea causes friction at the interface between air and sea. what are 'tides'? They are the regular rise and fall in water level experienced by seas and oceans in response to the gravitational influences of the Moon and the Sun, and the effects of the Earth's rotation. what is meant by 'ocean basin'? The oceanic crust is composed of relatively dense basalt and is some five to ten kilometres (three to six miles) thick. name some marine habitats? Coral reefs, cold water reefs harbour a wide array of species including corals. which algae is found here? Sargassum, kelp, meadows to name a few. and plants? Plant growth is higher like planktons. is there a law that governs it? Yes,"Freedom of the seas", the United Nations Convention on the Law of the Sea (UNCLOS), International Maritime Organization. are there deep sea explorations? Yes, discovered about 4,700 new marine species, and made 492 deep sea soundings, 133 bottom dredges, 151 open water trawls and 263 serial water temperature observations. how does it generate power? Offshore wind power is captured by wind turbines placed out at sea; it has the advantage that wind speeds are higher than on land. Tidal power uses generators to produce electricity from tidal flows.
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Sea [SEP] Marine pollution
Many substances enter the sea as a result of human activities. Combustion products are transported in the air and deposited into the sea by precipitation. Industrial outflows and sewage contribute heavy metals, pesticides, PCBs, disinfectants, household cleaning products and other synthetic chemicals. These become concentrated in the surface film and in marine sediment, especially estuarine mud. The result of all this contamination is largely unknown because of the large number of substances involved and the lack of information on their biological effects. The heavy metals of greatest concern are copper, lead, mercury, cadmium and zinc which may be bio-accumulated by marine organisms and are passed up the food chain.