Explain" Due to action of convection currents, the ocean floor is constanly renewing itself?
157169
Convection basically means heat rising.  Geologically speaking, along ocean ridges where tecto0nic plates intersect and the mantle has access to fissures in the tectonic plates magma will continually pour out of the fissures.  The best known of these is the mid Atlantic ridge that runs from the bottom of SouthAmerica to Iceland.  Magma continually spews from this fissure separating the tectonic plates.  The spewing magma forms new ocean floor.  Samples of iron rich minerals taken from the ridge indicate that since the earth's origin there have been pole reversals relatively often (in geologic time).  \n\nThe Pacific rim (part of the circle of fire) is also an example of renewal of ocean floor.  In the pacific rim, the Hawaiian Islands were formed from uprising magma.
510967
It is the area of land that is underwater for half the day and above water the other half. This is caused by the rise an fall of sea levels due to high and low tides.
509631
Hola Umar! Im just as confused as you are!\n\nNot Anymore, I got it! It is the Convection Zone!!!!!\n\nAbraham asked this question, I found it and did a double check and it is right!
1153828
actual motion of heated matter in streams called convection currents.
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.
791257
Convection isn't a force.\nConvection is the internal movement of currents within fluids (i.e. liquids and gases). It cannot occur in solids due to the particles not being able to flow freely. The most common cause of internal movement is a variation in density due to a transfer of heat. Other sources of density variations, such as variable composition (for example, salinity), or from the application of an external motive force are also often causes. Current movement may be invisibly slow, or it may be as fast as a tornado or twister. Convection occurs in atmospheres, oceans, and planetary mantles.
712469
The earth's crustal plates float on a layer called the Mantle, and it is convection in this mantle which drives the continental drift or plate tectonics.
116177
The ocean currents are a major factor in the climate of this planet. Many regions experience weather patterns and temperatures that are related primarily to the effect of ocean currents. Other weather patterns like hurricanes and El Niño events are also strongly affected by ocean currents.\n\nOcean currents in the Northern Hemisphere circulate in clockwise patterns around the basins. These are known as gyres. The Gulf Stream which moves northward up the western side of the Atlantic Ocean basin is responsible for moderating and warming the climate of Ireland, England, and northern Europe. The equatorial currents that move westward across the Pacific Ocean are an intrinsic part of the climate patterns known as El Niño and the Southern Oscillation. This climate pattern effects North and South America, Australia, India, eastern Asia, and even parts of Africa. Even Western Europe can statistically relate flooding events to El Niño. In years when El Niño is active hurricanes in the Atlantic have been found to be less active. \nhttp://typhoon.atmos.colostate.edu/\n\nOne scientist proposed that sub sea eruptions along the East Pacific Rise might be creating large volumes of rising heated water that would periodically mess up the ocean currents and cause the changes of weather patterns associated with El Niño/Southern Oscillation events. Another scientist attempting to verify this discovered that the El Niño events actually precede swarms of seismic activity in that area, and suggested the El Niño may actually be triggering the sub sea volcanic eruptions by slight changes in sea level and water pressure over the mid-ocean ridges. \nhttp://ess.geology.ufl.edu/usra_esse/ENSO_Oceans.html\n\nAnother important ocean current circulates deep in the oceans and actually moves through each of the world’s oceans in a continuous slow-moving belt known as the Conveyor. This is driven by cold, salty, North Atlantic water that sinks and moves southward to the Antarctic, where it moves eastward into the Pacific, and then northward to the North Pacific, where it turns and moves back through the Indian Ocean and toward the North Atlantic again.  It is estimated that if the Conveyer were to shut down, the North Atlantic region would be 20 degrees F. colder within ten years, and much of Europe would have a climate more like northern Norway has today.\nhttp://www.columbia.edu/cu/record/23/11/13.html
1175553
This would be false.\n\nIt has to do w/ convection currents in the mantle. This is the driving force behind plate tectonics.\n\nConvection currents are caused by uneven heating of molten rock in the mantle. As magma rises toward the crust, it becomes cooler & will then sink. As it sinks it will become hotter again causing a current to form.\n\nThis current actually moves the lithospheric plates. In some places where the lithospheric plates are broken they may be subducted but in others they will not. In this case (continental/continental boundaries) neither will be subducted. They will crumple up & deform. Many mountain ranges have been formed through continental/continental crust deformation.
958787
Mantle convection moves the plates\n\nAt plate boundaries, there are many forces at work: ridge push, slab pull, trench suction, slab roll back and basal shear resistance to name a few.\n\nThe links go into more detail about the forces and where they working.
182462
Quite simple, though not simple to explain.\n\nWind :- The Insolation (INcomming SOLar radiATION), from the sun (tortology - sp?, i know) warms up the ground ou ocean. These bodies radiate heat in the form of infra red radiation which in turn heats up the atmosphere. The hot air rises and as it does, cooler air flows across the surface to replace the air that rose. Ari flowing across the surface is wind.\n\nOcean currents opperate in a similar fashon.
79414
It is very simple really, although my explanation may seem complex. This was first observed in the Pacific Ocean during World War 2.  The US Navy first noticed magnetic anomalies in the sea bed during anti-submarine operations that were using airborne magnetometers to detect submarines. They began to notice variations in the magnetic field of different areas. Oceanographers in the 1950's adapted this technology and began mapping the magnetic anomalies of the sea floor. What they found were that there were symmetric patterns of magnetic field reversals preserved in the rock of the seafloor that were in wide bands parallel to the mid-ocean ridges.  These reversals of magnetic field preserved in the seafloor correspond with reversals of the earth's magnetic field that have been taking place over time. These reversals can be dated using paleomagnetic measurements of rock samples combined with other geologic data such as fossil evidence and techniques such as potassium-argon dating. There is now a well established magnetic record of much of earth's history. These magnetic stripes along the seafloor provide excellent proof of sea floor spreading by showing that the oldest parts of the seafloor are along the ocean boundaries near subduction zones and intersections with continental plates.\n\nA very good explanation with illustrations and history is here: \nhttp://www.tectonic-forces.org/simplified.htm
133507
The magnetic striping of the seafloor is similiar on both sides of an oceanic rift.  They match up like puzzle pieces.
329455
It becomes rock on the surface of the ocean floor. It is eventually carried further & further away.\n\nSome older rock created by this process has already been "recycled" in the rock cycle; it became molten when it was subducted under continental plates.\n\nAn interesting fact is that as new rock is being created at the Mid Atlantic Ridge, the earth's magnetic field is being recorded right into the rocks. Any time there is a change in the direction of the earth's magnetic field it has been recorded.\n\n:)
323948
Convection currents occur when a liquid or a gas is heated. The heated particles become less dense than the cold ones (because they're particles are moving faster) so they rise on top. The cold particles heat up beacause they're closer to the heat source and the hot particles cool down becuase they're farther away. This forms a kind of cycle, which is called convectiob.
519909
It's a combination of less sunlight & density currents.\n\nCold salty water is very dense. It sinks. This along w/ surface flow created by winds creates currents in the sea.\n\nCold water ends up on the bottom.\n\nThe amount of geothermal energy located on the ocean floor is negligible here. It only makes a difference on a local scale. The ocean floor is very deep and very large. Too much space for geothermal vents to heat.
725902
Hi. They are surface currents. : http://www.answers.com/topic/mixed-layer