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Across
  1. 1. The _______ and the mass of an object affects the ability of the object to float.
  2. 3. Light is refracted when it travels through transparent _________.
  3. 4. ________ on the Moon is smaller than on Earth.
  4. 5. ________ is the force that moves the object forward.
  5. 6. The ______ of light when it travels from one medium to another is called refraction.
Down
  1. 1. The periscope in the _______ helps people to see what's happening above the water.
  2. 2. The unit of weight.