If you were a marine scavenger living underwater, and there's a food source nearby, would you be able to pinpoint its location more easily in warm water or cold water?
204401
Tough question!  I really only have a hypothesis, so I'm not sure if this will help.\n\nSmell is triggered by suspended particles in a fluid (air or liquid are both, technically, fluids).  The higher the concentration, the higher the strength of the olfactory stimulation.  As per basic physics, temperature is a measure of the activity of the particles.  So in terms of the particle activity, warm water is moving faster, meaning the scent particles are being diffused away fast, making it more difficult to track them back to their source.  So my guess, based on this theory, is that cold water would leave a shorter but more intact scent trail back to the source.
47362
The US Marine Corps has this down to a science.  I suggest that if you ask one of their recruiters you will be amazed at the detailed answer.
81248
(m)\n\nHot water does not freeze - cold water does.\n\nHot water cools faster than cold water because they both follow approximately the rate equation delta T = -k*dT/dt.\n\nAfter washing the stained clothes in both hot and cold water, we determined that cold water removed most of the stains more efficiently.  Cold water removed all of the stains that hot water did not, with the exception of grape juice and mustard.  Neither hot nor cold water removed oil or grass stains efficiently.  It different detergents and/or stain removal substances, such as Shout, were applied to the grass and oil stains, they would more than likely be able to be removed.  Since oil needs heat to dissolve, it would probably be effectively removed with the proper stain removers in hot water.  We decided that not just hot or cold water can specifically be used to remove all types of stains all the time.  Each stain must be treated accordingly using the right detergent and the right water temperature.  \n\n \n\nAlthough hot water is needed to remove some stains, it also tends to fade the color of materials.  If there are no stains in clothes, it is more efficient to use cold water because you are saving energy by not needing water to be heated.  If clothes need to be washed in warm or hot water, you can save energy but washing big loads of laundry at once and rinsing them on a different, cooler cycle.    \n\n\nCold water pressure washers are most suitable for car, deck, grill, patio, sidewalk, house, bus, and truck power cleaning. Also, if you have a car washing or an airplane washing business cold water power washers are the best fitting machines for it.\n\nOn the other hand, hot water pressure washers are excellent for oil, grease, and fuel spills, and for sanitization. Hot water pressure washers are also the best candidates for places such as garages, industrial plants, agriculture machineries, service areas, food processing plants, and airport environments.\n\nCold (40 - 50 degrees F) water is absorbed more quickly from the stomach. Also, if cold water is drank during physical exercise has the dual effect of also cooling the internal body temperature along with sweat produced by exercise. Since sweat is your body’s way of cooling itself, leave sweat on your skin and you should feel cooler.
87503
depends on the ice...\n\nmany different types of ice in different states of being 'frozen' and at different temperatures and with\ndifferent degrees of purity of the water or other frozen substance...\n\nthe answer would be yes more often than no...
427440
I suppose if you took a fresh water fish and put him in the ocean, he wouldn't be able to deal with the salinity and would dehydrate - essentially die of thirst!!
51970
most likely fish, or another animal that lives in water, perhaps an early reptile
390188
I don't think it could "fall" into the ocean.\nBut if you follow along with global warming rasing the sea level, then at some point if it stayed where it is, that location would be underwater.  I would have to think it would be moved further inland if that happened.
59650
I think yes, definately! I work on Alaska's North Slope and I know that sound absolutely travels better at extremely cold temperatures. When it is minus 40 or 50 F you can hear vehicles coming from a much greater distance for example. Can't say why exactly. Maybe because the molecules in the air are closer together (condensed) and therefore transmit sound more efficiently (like water).
33197
whoissarthak's idea works, but that isn't a wet suit; that's a dry suit.  A wet suit works differently.  The idea is that there are basically three ways to move heat: conduction, radiation, and convection.  Conduction is when two things are in direct contact, like touching a hot stove or a cold flagpole.  Radiation has to do with the infrared light emited by warm bodies, and has nothing much to do with your project.  Convection is the real concern--it is the transfer of heat by means of a fluid intermediate, and it is the fast form of heat loss.\n\nYou're body sheds heat by means of perspiration, where sweat evaporates and takes heat away with it--that's convection.  When you fell colder in a strong breexe, that's convection taking heat away quicker.  When you blow on a spoon of hot soup to cool it, that's convection.\n\nThe way a wetsuit works is by not allowing the water in contact with the skin to be carried away.  It inhibits the movement of water through it.  Enough gets in to contact the skin and make your skin wet, which is why they call it a wetsuit, but that water doesn't leave easily.  It stays put and your body heats up the water.  Hence, the water in your wetsuit is much warmer than the water in the surrounding ocean, so the water taking heat from your skin is not quickly carried away and replaced by more cold water.\n\nIf you want to make a wetsuit, you want something htat will make it difficult (but not impossible) for water to come and go.
510218
like what do you mean,like why can you swim in cold weather? because the water is a higher temperature then outside...im learning this right now in science,but i dont listen alot...lol..sorry
369910
The temperature of the ocean at depth, anything more than several hundred feet, is 3.98 degrees C.  This is the temperature at which water is densest.\n\nIf any geothermal heat from the sea floor warms the very deepest water, it becomes less dense and rises.  And any shallower water warmed by the sun is too buoyant to descend towards deeper water.  3.98 degrees C is it, all the way to the bottom.
141779
Living micro-organisms have been found flourishing deep within the ice of Antarctica. Since ice freezes at 32 degrees Fahrenheit, I expect that's as cold as you can get and still allow the little beggars to move about, ingest nourishment and procreate. These are simple single-celled animals. Microbia.
341557
Great Whites are a cold water shark. Yes you can find one off Rhode Island, though your chances get better the further north you go.. As for Australia being the place to go, not really. South Africa actually gives you better odds to dive with one as does the area around Patagonia, heck...anywhere the water temperature is 75 F to 55 F.
419338
Yes, it would be that cold. April is still very cold in those waters. The Atlantic does in fact freeze at that latitude. Open waters do not get much seasonal ice do to wave action, but bays can and do freeze up. The seals breed on seasonal ice which is drifting out to sea by the time they whelp, and a few years ago an icebreaker had to be used to keep Boston harbour open
320439
Few complex life forms we know of can survive exposure temperatures that low for more than a moment. However, if pockets of milder temperatures could be found (thermal vents, well isulated hybernation dens, etc) some life would likely adapt. Life forms that could mature and reproduce in one warm season (such as a plant that produces spores capable of surviving such a harsh winter) would have a great advantage. Plants such as trees woudn't stand a chance, as is true of many things humans and other complex life depend on for food and shelter. \n\nAnother consideration would be the erosion due to lack of any plants capable of maintaining a root system to stablize soil. Between the turbidity from erosion and likelyhood that all rivers would freeze solid through most of the winter, most life in rivers and lakes would become extinct. Since the upper temperature is not much if any higher than what we have now, the average temperatue is much lower. This would concentrate vast amounts of water in the icecaps, possibly enough to greatly increase the salinity of the oceans, which would also see a major drop in temperature. Most marine life is more sensitive to temperatue changes than terrestrial or freshwater life, so a great number of extinctions there also.\n\nSo no, life would not survive other than perhaps a few simple life forms. Even a drop of a dozen degrees in average temperature would be devastating in the long run for life as we know it.
54457
It’s fairly complicated, but in simple terms it’s because warm water rises and cold water sinks.\n\nThe problem with nutrients in the ocean is that they are accumulated in the bodies of living things, and living things are solid, and solid objects tend to sink. A fish carcasse or a plankton carcasse might gloat for  a few hours or a few days, but then it sinks.  And it sinks straight to the bottom of the ocean, carrying all the nutrients it concentrated in its lifetime with it.\n\nAs a result upper level ocean waters tend to become nutrient depleted very quickly. Even if I spray fertiliser on the ocean to increase the nutrient levels I will only get a brief bloom of life, and then it will die… and sink straight to the bottom. Dead things like logs or wildebeest lie around on the surface on the land, and so the nutrient they accumulated can be released by decay and used all over again by other lifeforms. So you get localised nutrient cycling on the land. Living things in the ocean sink, so any nutrient added only lasts a few generations at best, then it is lost. It can’t be locally cycled.\n\nSo for an area of ocean to remain productive it needs to have a constant source of nutrients added to replace all those nutrients that are being lost as the sink into the depths.  That addition can come from rivers on a very localised scale, but for large scale work those nutrients can only come from one place, and that is the same place they escaped to in the first place: the nutrients have to come from the ocean depths.\n\nThe only way to drag up nutrients form the ocean depths is to have water rising form the ocean depths, right? Make sense? Water on the equator is already warm, and warm water floats on the surface. You can’t get the cold nutrient rich waters form the depth to the surface if the surface water is already warm.  But if the water is colder than the deep ocean water, then the deep water will rise like a bubble, bringing all those nutrients form the depths right to the surface.\n\nThis is most apparent in the arctic and antarctic spring. The sudden melt of ice causes the temperature of the liquid ocean to fall, not just because melted ice is cold but because the ice acted as a blanket all winter, and now it’s gone. The ocean surface becomes notably colder than the ocean depths. The surface water cascades down through the ocean like a submarine waterfall, and the deep nutrient rich waters rise like smoke form a fire, bringing nutrients with them. This is accompanied by a massive bloom in algae and is followed by a massive bloom in zooplankton feeding on it. And following the zooplankton come the plankton feeders: the fish, the whales and the seals. The productivity of the arctic and antarctic ocean in spring is as high as anywhere on earth despite the low temperatures. And it supports the largest animals that have ever lived.
523621
it's true,but the water can't be too cold.the best is to be between cold and warm,enough cold to refresh ya mouth,and enough warm to not affect ya teeth...