how can we prevent ocean dead zones from occuring around the world?
929747
Nitrogen runoff from farm fertilizers, sewage, and air pollution is one of the big causes of ocean dead zones. When the nitrogen flows to the sea, it acts as a fertilizer to plankton. The abundant plankton use up all the ocean's oxygen. \nMitigation: \nReducing the discharge of nitrogen to rivers by reducing runoff, using less fertilizer, reducing nitrogen emissions from cars and factories, treating sewage better.
992273
Old age, the Earth will gradually become uninhabitable over a very long period of time until the time comes when the few million people that are left only have legends about how the planet once supported billions.\nNuclear war,  pandemics, possible global warming would be as hiccups along the way.
474323
I  am very concerned about global Warming, The east coast could be underwater and the northpole could be gone in as little as 50 years. Today's choices could have a dramatic effect on the future. yet NOTHING is being done :(.
342985
Ocean currents can change the supply of scf level wind, and thier volume density, the fresher the water the more water vapor we would have.  Like with the effect of global warming yes, if there is too much fresh water entered into the oceans due to the melting of the sea ice at the poles, then the Thermohaline will indefinately stop, which would affect what are weather is like.  The waters in the tropics will become massively warmer and the water near the poles would be colder, and in order for the world to balance that out, it will create more hurricanes, to pick up the slack of lossing its main currents.
680484
The oceans are divided into two main zones: the pelagic and the benthic zones. The pelagic, the uppermost zone, is further divided into the euphotic or sunlit zone up to 660 feet, the dysphotic or twilight zone up to 3,300 feet, and the aphotic or midnight zone up to 20,000 feet.
84159
This cannot be done. Even when kept under the best of climatic condition, it will eventually dry up.
368092
The dead zone in the Gulf of Mexico is an area around the mouth of the Mississippi where there's a lot less sea life than in the rest of the Gulf Coast.  This is caused by over-fertilization in the Midwest.  Rain washes the fertilizer into the Mississippi and eventually into the Gulf.  All this fertilizer causes algae to grow wildly. As this algae dies and rots, the bacteria that decompose it use up most of the oxygen in the water, eventually 'suffocating' all the fish.\n\nI don't know if there's anything similar going in Lake Erie, but I think the one in the Gulf is the largest example of this problem anyone knows.  I can't think of any major rivers flowing through agricultural areas that empty into Lake Erie, so it seems like it might not have the same problem, but that's just a guess.
465815
Wind driven surface currents (such as the Gulf Stream) head polewards from the equatorial Atlantic Ocean, cooling all the while and eventually sinking at high latitudes (forming North Atlantic Deep Water). This dense water then flows downhill into the deep water basins, only resurfacing in the northeast Pacific Ocean 1200 years later. Extensive mixing therefore takes place between the ocean basins, reducing differences between them and making the Earth's ocean a global system. On their journey, the water masses piggyback both energy (in the form of heat) and matter (solids, dissolved substances and gases) around the globe. As such, the state of the circulation has a large impact on the climate of our planet.  It's also called thermohaline circulation
995032
It may gas off or have some activity,but the conditions that created it will probably not happen again.No one should be ramping up fear of the super volcanoes as there is not even a scintilla of enough earth heating to make them blow.
264363
Good thinking, unlike some of the answers here. Anything put in or on the water displaces water and makes the water level rise. The ocean is so huge that you could not measure it unless the rock was so large you could not move it.
340392
you can use ZoneAlarm program.It can control and block all of that.
127389
Pave the whole coastline.  That will significantly slow down erosion.
720934
The Earth is in danger of becoming almost totally inhospitable for most higher life forms.  Unless we start being more intelligent and get population and resource management under control, the Earth will do if for us.
1009505
make more ozone. jk the best way to prevent it is to not cut down as many trees, not use cfc's (clorofloracarbons), and cut down on major pollution, such as factories and cars like hummers
447836
The coastal areas are temperate and dry.  The Andes prevents moister air from the inland jungles from reaching the coast.  Ocean currents keep weather systems moving northward so away from the coast.
323351
near the equator in the an ocean ussualy
627881
Try to look for an earth science book that has pictures of the continents one million years ago and at the present, with arrows showing the direction of drift. Then try to imagine doing the drift again. I tell you, this would require huge amounts of brain power.\n\nI can tell you this: Los Angeles will go north along with the rest of California, the Himalayas will rise higher, the Mediterrainean will disappear, Australia will move northward, squishing Southeast Asia, Central America will move north, Antarctica will spin, and so will Asia, more islands will arise in the widening Pacific, while Africa will be split in two. You do the drawing.