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[Grade 4] U3.6 - Melting and Boiling Point

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  • Water vapor is a gas found in the air.
    False
    True
  • Solids have a fixed shape and cannot be squashed or compressed.
    False
    True
  • Air pollution only happens outside buildings.
    False
    True
  • The smoke from cigarettes does not affect air pollution.
    True
    False
  • The particles in solids vibrate in fixed positions.
    True
    False
  • In liquids, the particles are very close together.
    False
    True
  • There are big spaces between the particles in gases.
    False
    True
  • The atmosphere is the layer of air surrounding Earth.
    True
    False
  • Air is made up of only oxygen and nitrogen.
    True
    False
  • The particles in solid cannot move or vibrate freely or fast because they are held together so tightly.
    False
    True
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