The Allende Meteorite

托福阅读关于陨石的的形成和成分

The Allende Meteorite

• origin/initial/prime
  • time
    • Feb 8,1969
  • feature
    • large and lbright
  • process
    • broke and scatter
  • location
    • Allende
• Individual specimens
  • apeearence
    • when entered the atmosphere
      • with a black and glassy crust
    • when broke up
      • mixture of small, distinctive objects, spherial, irrgular
• name
  • infer them contained tiny seed/chondrules
    • formation
      • glss and crystal of silicate
    • conditions
      • melted at 1700 degrees and cooled
• compositions
  • refractory inclusions
  • paradox of the order
• chondrite matrix
  • dine-grained,mostly silicate minerals
  • by condensation and melting
• compared with the sun
  • not abundances but the ratio is same