Sentences with phrase «in sea floor sediment»

Pushed by the natural motion of wind and ocean currents — often over long distances — the litter is present in oceans worldwide, as well as in sea floor sediment and coastal sands.

Not exact matches

The rocks that entombed the partial remains of the whale (Messapicetus gregarius, depicted in an artist's reconstruction, above) accumulated as sea - floor sediments between 8.9 million and 9.9 million years ago, other fossils in the rocks suggest.

Confirmation arrived in February this year, when an international team extracted 34 sediment cores from three sites on the seabed, revealing a fossilised coral reef that reaches 110 metres into the sea floor.

The study suggests that layers of sediments perhaps 10 to 20 meters thick can seal the sea floor and make seamounts the most important conduits for heat and fluid flow — especially on the sloping flank of a midocean ridge, says oceanographer John Sclater of the Scripps Institution of Oceanography in La Jolla, California.

It was discovered in sediment on the sea floor off the coast of Namibia.

Dr. Hoffmann: «The isotope Hafnium 176 in contrast to its counterpart Neodymium 143 was transported by means of weathering into the oceans and became part of iron - rich sediments on the sea floor 2,700 million years ago.»

Microorganisms living in basaltic sea floor buried beneath sediments derive energy from inorganic components from the host rocks that interact with infiltrating seawater, which brings dissolved oxygen and other trace nutrients with it.

The evidence is now clear that far below the sea, and far below the floor of the sea, in sediments all over the world, microbes live to astonishing depths — the record so far is half a mile — and in astonishing numbers.

Each new batch of sediment that settles onto the sea floor contains bacteria; as those bacteria were exposed to the oxygen in the water, they began storing a chemical called phosphate in their cells.

Its large Edward Scissorhands - like claws with their elongated spines may have been used to capture prey, or they could have helped it to probe the sea floor looking for sea creatures hiding in sediment.

At threshold sedimentation rates of 1 millimeter per 1000 years, the low rates of microbial community metabolism in the North Pacific Gyre allow sediments to remain oxygenated tens of meters below the sea floor.

Many others, he notes, suggest that samples are too easily contaminated during drilling by microbes that live in overlying sediments, or by inadequate precautions while handling the samples once they've been retrieved from the sea floor.

Microbes such as bacteria are the most numerous organisms on Earth, and about 90 % of them live in sediments buried under the sea floor.

However, many of the sources along the continental slope lie at cold depths in which ices have formed at high pressures within sea - floor sediments, which once trapped methane produced by microbes living there.

The most likely explanation is the mass release of methane from sediments on the sea floor, where the gas was sequestered, as it is now, in a solid form as methane hydrate.

For this to happen, the organism typically must first become quickly buried in sediment on the floor of the sea or some other body of water.

In the summertime, grays are in the Bering and Chukchi seas of Alaska plowing the sea floor with open mouths to feed on creatures that live in bottom sedimentIn the summertime, grays are in the Bering and Chukchi seas of Alaska plowing the sea floor with open mouths to feed on creatures that live in bottom sedimentin the Bering and Chukchi seas of Alaska plowing the sea floor with open mouths to feed on creatures that live in bottom sedimentin bottom sediments.

The gray whale is unique in the use of its baleen feeding technique as contrasted to other baleen whales.According to the National Marine Mammal Laboratory, «Gray whales are bottom feeders, and suck sediment and the «benthic» amphipods that are their prey from the sea floor.

>... there are still ways of discovering the temperatures of past centuries,... tree rings... Core samples from drilling in ice fields... historical reconstruction... coral growth, isotope data from sea floor sediment, and insects, all of which point to a very warm climate in medieval times.

In a core of sediments taken from the sea floor that was once covered by the Larsen A Ice Shelf, researchers led by Dr. Eugene W. Domack, a professor of geology at Hamilton College in Clinton, N.Y., found the tiny fossils of marine algaIn a core of sediments taken from the sea floor that was once covered by the Larsen A Ice Shelf, researchers led by Dr. Eugene W. Domack, a professor of geology at Hamilton College in Clinton, N.Y., found the tiny fossils of marine algain Clinton, N.Y., found the tiny fossils of marine algae.

The oceans are buffered by sediments and volcanic rocks on the sea floor and even in past times when atmospheric temperature and CO2 were far higher than at present, there were no acid oceans.

They live only in a few borderline places, however; for global temperatures scientists use not only other species of trees but a wide variety of «proxies» from ice cores, coral reefs, cave deposits, the sea floor, pollen in lake sediments, boreholes in rock and so forth.

Using chemical tracers in sediment that builds up on the sea floor over time, Henry and his co-authors were able to document the relative speed of the Atlantic meridional overturning circulation during each abrupt climate change.

However, most of the methane produced from dissociating marine hydrates will be consumed by anaerobic processes in the top few metres of sulphate - rich near - sea - floor sediments and all of the rest will be dissolved and oxidized in sea water and will not be released to the atmosphere as methane, although the dissolved CO2 will equilibrate with atmosphere after a few centuries.

Proxy data such as those generated from ice core samples, measurements of tree rings intervals, bore samples taken from sediments from the ocean and sea floor, and measurement of gases from bubbles trapped in ice are some examples of preserved physical characteristics of the past used by scientists to reconstruct prevailing climatic conditions in the past.

Much of the color likely comes from resuspended sediment dredged up from the sea floor in shallow waters.

Episodic and explosive escapes of gaseous methane from the sediment column have been documented by kilometer - scale «wipeout zones» in seismic images (Riedel et al., 2002), and pockmarks on the sea floor, called eruption craters (Hill et al., 2004).

In the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin MilankovitcIn the 1970s, the first comprehensive analysis of oxygen isotopes in sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitcin sediments from cores taken from the sea floor established for the first time that the timing of the Ice Ages was linked to subtle changes in the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitcin the Earth's orbit around the Sun as suggested long ago by Serbian mathematician Milutin Milankovitch.