(a.) Ancient; pertaining to the earliest period in geological history.
(n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.
Example Sentences:
(1) We formulate the following hypothesis: Life's origin may have occurred during the lower Archaean at a time when the environmental temperature was higher than it is at present.
(2) Hence, the occurrence of sulfate evaporites in Archaean sediments does not necessarily provide testimony of oxidation weathering on the ancient continents and, consequently, of the existence of an atmospheric oxygen reservoir.
(3) Incipient minor differentiation of the isotope pattersn notably of Archaean sulfates may be accounted for by photosynthetic sulfur bacteria rather than by sulfate reducers.
(4) (2) Isotopic evidence of dissimilatory sulfate reduction is first observed in the upper Archaean of the Aldan Shield, Siberia (approximately 3.0 x 10(9) yr) and in the Michipicoten and Woman River banded iron formations of Canada (2.75 x 10(9) yr).
(5) The presently available sedimentary sulfur isotope record for the Precambrian seems to allow the following conclusions: (1) In the Early Archaean, sedimentary delta 34S patterns attributable to bacteriogenic sulfate reduction are generally absent.
(6) (4) With the bulk of sulfate in the Archaean oceans probably produced by photosynthetic sulfur bacteria, the accumulation of SO4(2-) in the ancient seas must have preceded the buildup of appreciable steady state levels of free oxygen.
Ocean
Definition:
(n.) The whole body of salt water which covers more than three fifths of the surface of the globe; -- called also the sea, or great sea.
(n.) One of the large bodies of water into which the great ocean is regarded as divided, as the Atlantic, Pacific, Indian, Arctic and Antarctic oceans.
(n.) An immense expanse; any vast space or quantity without apparent limits; as, the boundless ocean of eternity; an ocean of affairs.
(a.) Of or pertaining to the main or great sea; as, the ocean waves; an ocean stream.
Example Sentences:
(1) There are no oceans wide enough to stop us from dreaming.
(2) Undaunted by the sickening swell of the ocean and wrapped up against the chilly wind, Straneo, of Woods Hole Oceanographic Institution, one of the world's leading oceanographic research centres, continues to take measurements from the waters as the long Arctic dusk falls.
(3) I hope they fight for the money to make their jobs worth doing, because it's only with the money (a drop in the ocean though it may be) that they'll be able to do anything.
(4) n. from the body cavity of Scomber scombrus from the Indian ocean is described.
(5) Its first two features, Earth and Oceans , together took nearly $200m worldwide.
(6) They’ve already collaborated with folks like DOOM, Ghostface Killah and Frank Ocean; I was lucky enough to hear a sneak peek of their incredible collaboration with Future Islands’ Sam Herring from their forthcoming album.
(7) The worldwide pattern of movement of DDT residues appears to be from the land through the atmosphere into the oceans and into the oceanic abyss.
(8) An international team led by Luciano Iess at the Sapienza University in Rome inferred the existence of the ocean after taking a series of exquisite measurements made during three fly-bys between April 2010 and May 2012, which brought the Cassini spacecraft within 100km of the surface of Enceladus.
(9) While winds gusting to 170mph caused significant damage, the devastation in areas such as Tacloban – where scenes are reminiscent of the 2004 Indian ocean tsunami – was principally the work of the 6-metre-high storm surge, which carried away even the concrete buildings in which many people sought shelter.
(10) India will have three carriers and both China and India are building blue-water [ocean-going] navies.
(11) Similar organisms were found in the water at the site of the accident in Boston, and at ocean bathing beaches on nearby Martha's Vineyard.
(12) Australia is hoping to put a permanent end to Japan's annual slaughter of hundreds of whales in the Southern Ocean, in a landmark legal challenge that begins this week.
(13) An empirical rate expression was developed from experimental data which led to a prediction that the natural rate of oxidation in the ocean is about 0.023 micromoles of As(III) per liter each year.
(14) The melting of sea ice, ice caps and glaciers across the planet is one of the clearest signs of global warming and the UK-led team of scientists will use the data from CryoSat-2 to track how this is affecting ocean currents, sea levels and the overall global climate.
(15) It cannot be established whether or not seasickness contributed to the cause of death in the case of the Ocean Ranger victims, but it did occur in 75% or more of TEMPSC occupants in the other four rig disasters.
(16) Total concentrations can range from a few parts per million in non-polluted intertidal and oceanic areas to parts per thousand in heavily contaminated estuarine, lake and near-shore environments.
(17) Campbell said that if all signatories to the convention killed as many minke whales as Japan does, then more than 83,000 would be slaughtered in the Southern Ocean every year.
(18) The French president, François Hollande, summoned key ministers to a crisis meeting on Thursday afternoon, postponing a planned visit to France's Indian Ocean territories.
(19) The outcome is a belief that the Earth is being slowly strangled by a gaudy coat of impermeable plastic waste that collects in great floating islands in the world's oceans; clogs up canals and rivers; and is swallowed by animals, birds and sea creatures.
(20) He added that if the DigitalGlobe satellites are normally designed for analysis of land masses, not ocean searches.