carbonaceous$11335$ - ορισμός. Τι είναι το carbonaceous$11335$
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Τι (ποιος) είναι carbonaceous$11335$ - ορισμός

EVIDENCE OF PREHISTORIC LIFE
Carbonaceous films; Carbonaceous film

Small carbonaceous fossil         
  • A fragment of [[Silurian]] arthropod cuticle with attached setae, extracted by delicate acid maceration
Small Carbonaceous Fossil; Small carbonaceous fossils; Carbonaceous microfossil
Small carbonaceous fossils (SCFs) are sub-millimetric organic remains of organisms preserved in sedimentary strata.
Carbonaceous chondrite         
  • Gujba meteorite, a  bencubbinite found in Nigeria. Polished slice, 4.6 x 3.8 cm. Note the nickel-iron chondrules, which have been age-dated to 4.5627 billion years.
  • Murchison meteorite
  • NWA 3118, CV3
CLASS OF CHONDRITIC METEORITES
Carbonaceous Chondrite; Carbonaceous chondrites; C chondrite; Bencubbinite; CK chondrite; CH chondrite; CB chondrite; CO chondrite; CR chondrite; CV chondrite
Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites.
Carbon         
  • This anthracene derivative contains a carbon atom with 5 formal electron pairs around it.
  • [[Antoine Lavoisier]] in his youth
  • Correlation between the ''carbon cycle'' and formation of organic compounds. In plants, carbon dioxide formed by carbon fixation can join with water in [[photosynthesis]] (<span style="color:green;">green</span>) to form organic compounds, which can be used and further converted by both plants and animals.
  • 60}} fullerene in crystalline form
  • doi-access=free}}</ref>
  • Diagram of the carbon cycle. The black numbers indicate how much carbon is stored in various reservoirs, in billions tonnes ("GtC" stands for gigatonnes of carbon; figures are circa 2004). The purple numbers indicate how much carbon moves between reservoirs each year. The sediments, as defined in this diagram, do not include the ≈70&nbsp;million GtC of carbonate rock and [[kerogen]].
  • [[Carl Wilhelm Scheele]]
  • Sticks of vine and compressed [[charcoal]]
  • 70}}); g) [[amorphous carbon]]; h) [[carbon nanotube]]
  • A large sample of glassy carbon
  • Diamond output in 2005
  • Graphite ore, shown with a penny for scale
  • A cloth of woven carbon fibres
  • Pencil leads for mechanical pencils are made of [[graphite]] (often mixed with a clay or synthetic binder).
  • Structural formula of [[methane]], the simplest possible organic compound.
  • Raw diamond crystal
  • [[Silicon carbide]] [[single crystal]]
  • [[Tungsten carbide]] [[endmills]]
  • GLODAP]] [[climatology]])
  • Worker at [[carbon black]] plant in [[Sunray, Texas]] (photo by [[John Vachon]], 1942)
CHEMICAL ELEMENT WITH SYMBOL C AND ATOMIC NUMBER 6; COMMON ELEMENT OF ALL KNOWN LIFE
Element 6; Carbonaceous; Carbons; Carbonous; Carbon (element); Carbon atom; Carbonic; C (element); Carbon atoms; Carbon Atom; Atomic number 6; History of carbon; Carbon gas; Properties of carbon
Carbon (from "coal") is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—its atom making four electrons available to form covalent chemical bonds.

Βικιπαίδεια

Carbonaceous film (paleontology)

A carbonaceous film or carbon film is an organism outline of a fossil. It is a type of fossil found in any rock when organic material is compressed, leaving only a carbon residue or film.

When an organism is buried under many layers of sediment, pressure and heat increase during diagenesis and if the organism lacks a hard skeleton, it will only leave this thin film of carbon residue on rock surfaces.

The soft tissues of organisms are made largely of organic carbon compounds. Sometimes, fossils contain only carbon. Fossils usually form when sediment buries a dead organism. As sediment piles up, the organism's remains are subjected to pressure and heat. These conditions force gases and liquids from the body. A thin film of carbon residue is left, forming a silhouette of the original organism called a carbon film. Plant fossils often occur as a residue or film of carbon.

The delicate fossils of the Burgess Shale include carbon film forms. Graptolites are an example of carbon film fossils.