Sentences with phrase «ocean sediment deposits»

Avery also disputes the scientific consensus on global warming, ascribing the warming to «sunspots,» purportedly based on information about ice cores and deep ocean sediment deposits.

Not exact matches

Just before the Hell Creek sediments were deposited, about 68 million years ago, the seaway withdrew for good, leaving behind the configuration of continent and surrounding oceans that exists today.

That may in turn have caused the planet to heat up enough to melt deposits of methane frozen in sediments on the ocean floor (something, incidentally, that could happen again), discharging even more potent greenhouse gases into the atmosphere and further heating the planet in an escalating feedback loop.

Scientists» understanding of the climate during the Pliocene has largely been pieced together from fossil records preserved in sediments deposited beneath lakes and on the ocean floor.

Gard says that when the ice opened ocean sediments were deposited rapidly and algae grew quickly (Geology, March, vol 21, p 227).

The shale, named for the town of Eagle Ford, TX, is a geologic remnant of the ancient ocean that covered present day Texas millions of years ago, when the remains of sea life (especially ancient plankton) died and deposited onto the seafloor, were buried by several hundred feet of sediment, eventually turning into the rich source of hydrocarbons we have today.The shale was first tapped in 2008 and now has around 20 active fields good producing over 900 million cubic feet per day of natural gas.

As they hoped, the river carried away the sediment and deposited most of it in the Strait of Juan de Fuca, the body of water that connects Puget Sound to the Pacific Ocean.

These sediments, collected in modern day Iran, were deposited 252 - 246 million years ago in a relatively shallow tropical ocean near the equator.

An infrared spectrometer built by Jean - Pierre Bibring of the Institute of Space Astrophysics in Orsay, France, will make a mineralogical map of the planet's surface, looking in part for the carbonate sediments that should have been deposited in Martian lakes or oceans.

In the shallower Arctic Ocean most of those deposits are tucked underneath a thick layer of sediment, impeding their travel.

Most of the deposits, some small and some large, are buried in or below permafrost and sediments in the ocean bottom along continental margins — where shallow offshore waters slope down toward the deeper ocean floor.

Worldwide, particularly in deeply buried permafrost and in high - latitude ocean sediments where pressures are high and temperatures are below freezing, icy deposits called hydrates hold immense amounts of methane (SN: 6/25/05, p. 410).

Now researchers from MIT and the Woods Hole Oceanographic Institution (WHOI) have devised a simple way to predict a river delta's shape, given two competing factors: its river's force in depositing sediment into the ocean, and ocean waves» strength in pushing that sediment back along the coast.

They analysed sediments from a shallow Atlantic Ocean shelf where sediment accumulates faster than it does in the deep sea, making it easier to see seasonal fluctuations in the amount deposited.

Carbonic acid dissociated to form hydrogen ions, which found their way into the structures of weathering minerals, and bicarbonate, which was carried down rivers and streams to be deposited as limestone and other minerals in ocean sediments.

Donnelly's team examined cores of sediment sampled from two of the salt pond's deepest points, searching for layers that were deposited when storms violently washed ocean sand into the 65 - acre waterway.

The fate of Bangladesh's lowlands will be determined by a mix of changes in the height of the Indian Ocean, subsidence of deltas as aquifers are drained and newly deposited sediments compress, and the addition of all that Himalayan soil.

Another vast source of methane is in icy deposits known as methane hydrates, often in sediments deep under the world's oceans.

The clues found in sediments deposited during the late Holocene suggest that an ocean current that circles the southern polar region, known as Circumpolar Deep Water, flowed underneath the Cosgrove Ice Shelf and melted it.

Eventually, over hundreds of millennia, weathering of rocks will deposit all of this initial CO2 pulse on the ocean floor as carbonate sediments [168].

These sediments were deposited 246 - 252 million years ago in a shallow tropical ocean near the equator.

After all, this man is presumably incapable of differentiating between ocean sediments and coral terrestrial deposits, nor can he go about analysing tree ring records and so on.

[1] Originally thought to occur only in the outer regions of the Solar System where temperatures are low and water ice is common, significant deposits of methane clathrate have been found under sediments on the ocean floors of Earth.

[1] Originally thought to occur only in the outer regions of the Solar System, where temperatures are low and water ice is common, significant deposits of methane clathrate have been found under sediments on the ocean floors of the Earth.

If a crack opens up in the ocean floor down to clathrate deposits, the pressure on these deposits is reduced since the density of the sediment that formerly kept the pressure at a certain level is 2.5 times as much as the water which fills the crack.

Quantities such as tree ring widths, coral growth, isotope variations in ice cores, ocean and lake sediments, cave deposits, fossils, ice cores, borehole temperatures, and glacier length records are correlated with climatic fluctuations.

Left behind by an ancient ocean, salt deposits lie beneath the Gulf seafloor and get pressed and squeezed and bulged by the heavy sediments laying on top of them.

Coral reefs in the Caribbean and Bahamas are already struggling to cope with nitrate pollution, sediment deposits, coral bleaching, ocean acidification, and overfishing.

The continental glaciations of the Pleistocene left signatures on the landscape in the form of glacial deposits and landforms; however, the best knowledge of the magnitude and timing of the various glacial and interglacial periods comes from oxygen isotope records in ocean sediments.