Sentences with phrase «on sea floor sediment»

This enteropneust, or «acorn,» worm feeds on sea floor sediment leaving behind curling, wavy, tracks.

Not exact matches

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.

They note that it is completely buried by sediments from more recent eras, which indicates it was formed long before its surroundings, and that it has no topographic expression on the present sea floor.

When the weather warms and no ice sits upon the seas, the sediment on the ocean floor is mainly organic: remains of plankton and diatoms.

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.»

Before, during and after the PETM, these sediments were laid down on the sea floor at the edge of the Atlantic Ocean, at depths of ~ 1000m, on the boundary between the continents and the open ocean.

On a hypothetical journey to the centre of the Earth starting at the sea floor, you would travel through sediment, a layer of basalt, and then hit the gabbroic layer, which lies directly above the mantle.

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

There, they collected mud from the sea floor, which builds up for millions of years like a giant layer cake as newer sediments pile on top of older ones.

Once Balog learned that tree rings, sea floor sediments, and ice core data were showing that the climate is warming on average, he changed his mind.

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 sediments.

So if you want to check whether erosion and sediment transport were taking place during the Pliocene, the best bet is to sample the sediments on the sea - floor dating from that time, by drilling through them and taking cores.

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.

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.

On still longer time scales, acidification by the invading CO2 dissolves carbonate sediments on the sea floor, which further enhances ocean uptakOn still longer time scales, acidification by the invading CO2 dissolves carbonate sediments on the sea floor, which further enhances ocean uptakon the sea floor, which further enhances ocean uptake.

Scientists devised ingenious techniques to recover evidence from the distant past, first from deposits left on land, then also from sea floor sediments, and then still better by drilling deep into ice.

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).