TPO48 L4

托福听力思维导图TPO48 LECTURE4 ASTRONOMY（天文学）

METEORITES

• identify
  • same chmcl elmnts on Earth / diff proportion
  • types(mostly from asteroid)
    • stones
      • 95% but hard to spot
    • stones iron
    • iron
    • 5% but easy to find/ using metal detector
• THEME:the nature and origin of meteorites
• PROF:go over the different types of meteorites
• comets
  • gas giants
• asteroids
  • rocks and metals
• Jupiter
• Mar / Earth
• meteoriod
• meteor