Earth Changes
If the trend continues, the field may collapse altogether and then reverse. Compasses would point south instead of north.
Not surprisingly, Hollywood has already seized on this new twist in the natural-disaster genre. Last year Tinseltown released The Core, a film in which the collapse of Earth's magnetic field leads to massive electrical storms, blasts of solar radiation, and birds incapable of navigation.
Entertainment value aside, the portrayal wasn't accurate, according to scientists who say the phenomenon of Earth's fading magnetic field is no cause to worry.
The plume, which stretches some 43.5 miles (70 kilometers) long, appears to be active on a previously unseen scale.
"In a nutshell, this thing is at least 10 times - or possibly 20 times - bigger than anything of its kind that's been seen before," said Bramley Murton of the British National Oceanography Centre.
Scientists reported the finding last week at the fall meeting of the American Geophysical Union (AGU) in San Francisco. Researchers also announced newly discovered deep-sea hydrothermal fields in the Arctic Ocean and the south Atlantic.

The effects of cellphone radiation being observed in an artificial hive as part of the Punjab University experiment
Humans will not be the lone beneficiaries of a study recently sought by the chief minister on the ill-effects of radiation from cellphones and Mumbai's 1,000-plus cellphone towers.
The initiative may just come to the timely rescue of the city's endangered honeybee population. And if you think that the bee is too small a concern to hit your radar, consider what Einstein said: "If the bee disappears from the surface of the Earth, man would have no more than four years to live."
A recent experiment conducted by the Punjab University at Chandigarh reiterates the finding that honeybees are disappearing from their colonies because of the electro-pollution in the environment.
Grid experts have long worried that the high-altitude detonation of a nuclear weapon would send a damaging pulse of energy to earth. And changes in solar activity have occasionally distorted the earth's magnetic field and generated currents in the rock that have caused blackouts.
What the threats have in common, said Jerry Cauley, the president and chief executive of Nerc, is the "potential to simultaneously impact many assets at once.'' The grid comprises 200,000 miles of transmission lines and millions of digital controls, he pointed out. The study is an attempt to map out preparations for events that are rare or have so far never happened, what the Energy Department calls "high-impact, low-frequency events."
Climate scientists have suspected - but never been able to prove - that the CO2 was the result of a huge belch of gas from the oceans. They predicted that the ice age had slowed ocean circulation, trapping CO2 deep within it, and that warmer temperatures reversed this process.
Signs of stagnant CO2-rich water have now been discovered 3700 metres beneath the Southern Ocean's seabed, between Antarctica and South Africa.
Stewart Fallon of the Australian National University in Canberra and his colleagues collected samples from drill cores of the marine crust of tiny marine fossils called foraminifera. Different species of these lived at the surface and the bottom of the ocean. The chemical composition of their shells is dependent on the water they form in and how much CO2 it contains.
Molten iron flowing in the outer core generates the Earth's geodynamo, leading to a planetary-scale magnetic field. Beyond this, though, geophysicists know very little for certain about the field, such as its strength in the core or why its orientation fluctuates regularly. Researchers do suspect, however, that field variations are strongly linked with changing conditions within the molten core.
As we cannot access the Earth's core directly, researchers look to clues at the Earth's surface. One intriguing suggestion is that changing conditions at the core could have an impact on angular momentum throughout the whole Earth system. The implication is that variation to the flow patterns in the core could have an impact on the Earth's rotation, which could lead to slight variations in the length of a day.

A child walks through flood waters caused by torrential rains outside his home in Karachi, Pakistan, Sunday, June 6, 2010. An approaching tropical storm triggered torrential rains in Pakistan's largest city and surrounding areas on Sunday, collapsing mud houses and submerging roads.
Authorities feared worse flooding was to come in and around Karachi and tried to evacuate people from their homes elsewhere along the country's southern coastline. Some villagers refused to move, but several thousand people shifted to higher ground, said Hamal Kalmati, a government minister in Baluchistan province.
He said many mud houses in Gawadar and Pasni districts had already collapsed.
The storm made landfall late Sunday to the east of Karachi, bringing winds as high as 50 miles (80 kilometers) per hour. The meteorological department said ocean storm surges of between 2 and 4 meters were likely in Karachi and other coastal towns.
It could be an image from a grisly sci-fi movie. But it is not. This bird is a shocking illustration of the catastrophic impact of the Gulf of Mexico oil spill on local wildlife.
The pelican - the official bird of Louisiana - was one of a number that were saved off the coast of the state.
They were barely able to walk or get out of the sea near East Grand Terre island, where officials found around 35 of the birds.
They were treated with detergents to wash off the oil. Many more animals have not been so lucky. More than 400 dead birds have so far been recovered.
Images such as this will only fuel anger towards BP as the spill enters its 46th day and the company struggles to stem the flow of oil from the ruptured Deepwater Horizon well.
Previously, photographs of wildlife coated in an oily sheen were as bad as it got. But now the animals are drowning in the muck, as thick and sticky as treacle, and much, much harder to clean up.

Bethany Millhime looks for personal belongings in the aftermath of tornado damage in Millbury, Ohio Sunday, June 6, 2010.
Rescue officials in northwest Ohio were still searching through homes Sunday and couldn't say whether anyone else was missing, Lake Township Fire Chief Todd Walters said. Police Chief Mark Hummer flew over the damaged area and said at least 50 homes were destroyed and another 50 severely damaged, as well as six commercial buildings. He estimated a 7-mile path of destruction about 100 yards wide. The storm that hit around 11 p.m. Saturday fell over an area of farm fields and light industry, narrowly missing the heavily populated suburbs on the southern edge of Toledo.
"It's a war zone," Hummer said. "It's pretty disheartening."
Hummer said that among those killed were a person outside the police department and a motorist. He said a young child and two other victims were from nearby Millbury, a bedroom community of roughly 1,200 about 10 miles southeast of Toledo. The National Weather Service had confirmed Sunday afternoon that a Toledo-area tornado was part of the storm, said Meteorologist Marty Mullen of the service's Cleveland office.
Click here to see tornado damage photos.

Plaquemines Parish coastal zone director P.J. Hahn lifts an oil-covered pelican which was stuck in oil at Queen Bess Island in Barataria Bay, just off the Gulf of Mexico in Plaquemines Parish, La., Saturday, June 5, 2010.
On Barataria Bay, Louisiana - The wildlife apocalypse along the Gulf Coast that everyone has feared for weeks is fast becoming a terrible reality.
Pelicans struggle to free themselves from oil, thick as tar, that gathers in hip-deep pools, while others stretch out useless wings, feathers dripping with crude. Dead birds and dolphins wash ashore, coated in the sludge. Seashells that once glinted pearly white under the hot June sun are stained crimson.
Scenes like this played out along miles of shoreline Saturday, nearly seven weeks after a BP rig exploded and the wellhead a mile below the surface began belching millions of gallon of oil.