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VOCABULARY:Unit 2: Speaking Mind 4

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  • a substance used in or produced by chemistry
    chemical
  • an organism with only one cell
    bacteria
  • the air aroung the Earth
    atmosphere
  • a very small piece of something
    particle
  • a gas in the air; symbol O
    Oxigen
  • a hard material that is formed by materials
    rock
  • the northern or southern half of the Earth
    hemisphere
  • plants with no roots or leaves that grow in water
    algae
  • a large, thin, flat area of frozen water
    ice sheet
  • a gas in the air. Symbol N
    nitrogen
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