What do all the words tell about ?

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Across
  1. 2. Not a planet. Has no light itself. But it reflects the light of the sun so we see it shines.
  2. 4. The kind of force that pulls you down to the earth. If there's no _______, you'll fly (float) in the air all the time !
  3. 5. Action verb. You ______ in the air(not falling down) or ______ in water(not sinking).
  4. 7. A kind of feeling. If you feel something is _______, you try very hard to lift it up.
Down
  1. 1. A kind of vehicles (like cars, boats, planes...) It can take you out of earth !
  2. 3. The name of the planet we live on.
  3. 6. A kind of feeling. A feather or a balloon feels ______.
  4. 8. Something you cannot see or smell. But without it, people will die.