chondritic sentence in Hindi
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- The existing range of compositional estimates of the Earth reflects our lack of understanding of what were the processes and building blocks ( chondritic meteorites ) that contributed to its formation.
- Planetary scientists classify chondritic IDPs in terms of their diminishing degree of oxidation so that they fall into three major groups : the carbonaneous, the ordinary, and the enstatite chondrites.
- Hafnium / tungsten ( Hf / W ) isotopic ratios, when compared with a chondritic reference frame, show a marked enrichment in the silicate earth indicating depletion in Earth's core.
- Like many chondrites, Allende is a breccia, and contains many dark-colored clasts or " dark inclusions " which have a chondritic structure that is distinct from the rest of the meteorite.
- For some of the less-studied stony meteorite falls, it is not known whether the object is chondritic; thus the number of meteorites that can be so grouped is 4 % lower than shown above.
- The mantle is assumed to have undergone chondritic evolution, and thus deviations in initial 143 Nd / 144 Nd ratios can provide information as to when a particular rock or reservoir was separated from the mantle within the Earth's past.
- The evidence for the Alvarez impact theory is supported by chondritic meteorites and asteroids which have an iridium concentration of ~ 455 parts per billion, much higher than ~ 0.3 parts per billion typical of the Earth's crust.
- In addition DCO research on primitive chondritic meteorites indicates that Earth is relatively depleted in highly volatile elements compared to chondrites, though DCO's research is further examining whether large reservoirs of carbon may be hidden in the mantle and core.
- The high pH is interpreted to be a consequence of serpentinization of chondritic rock that leads to the generation of H 2, a geochemical source of energy that can support both abiotic and biological synthesis of organic molecules such as those that have been detected in Enceladus's plumes.
- The "'CHondritic Uniform Reservoir "'or "'CHUR "'is a scientific model in astrophysics and geochemistry for the mean chemical composition of the part of the Solar Nebula from which, during the formation of the Solar System, chondrites formed.
- The smaller size of the yttrium group allows it a greater solid solubility in the rock-forming minerals that comprise Earth's mantle, and thus yttrium and the yttrium earths show less enrichment in Earth's crust relative to chondritic abundance, than does cerium and the cerium earths.
- The researchers found that the fragments from the crater zone had a chondritic texture and the following mineral composition : pyroxene ( 1 ) 40 %, olivine 20 %, feldspar 10 %, pyroxene ( 2 ) 10 %; kamacite 15 %, troilite 5 %, and traces of chromite and native copper.
- INGEMMET ( " Instituto Geol�gico Minero y Metal�rgico " ) of Peru released in September 2007 an analysis which showed that the fragments from the meteorite had a chondritic texture and a mineral composition of pyroxene ( 1 ) 40 %, olivine 20 %, feldspar 10 %, pyroxene ( 2 ) 10 %; kamacite 15 %, troilite 5 %, and traces of chromite and native copper.
- One of the authors, Owen Toon notes : " In this new scenario, organics can be produced efficiently in the early atmosphere, leading us back to the organic-rich soup-in-the-ocean concept . . . I think this study makes the experiments by Miller and others relevant again . " Outgassing calculations using a chondritic model for the early earth complement the Waterloo / Colorado results in re-establishing the importance of the Miller Urey experiment.
- Using the chondritic reference model and combining known compositions of the mantle, the unknown component, the composition of the inner and outer core, can be determined; 85 % Fe, 5 % Ni, 0.9 % Cr, 0.25 % Co, and all other refractory metals at very low concentration . and a 4 5 % weight deficit for the inner core; which is attributed to lighter elements that should be cosmically abundant and are iron-soluble; H, O, C, S, P, and Si.
- Because chondrites accumulated from material that formed very early in the history of the solar system, and because chondritic asteroids did not melt, they have very primitive compositions . " Primitive, " in this sense, means that the abundances of most chemical elements do not differ greatly from those that are measured by spectroscopic methods in the photosphere of the sun, which in turn should be well-representative of the entire solar system ( note : to make such a comparison between a gaseous object like the sun and a rock like a chondrite, scientists choose one rock-forming element, such as silicon, to use as a reference point, and then compare ratios.
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