science crossword class 3

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Across
  1. 2. It swallows blood
  2. 5. I breathe through gills
  3. 7. It carries loads for us
Down
  1. 1. I am a non green plant
  2. 3. I am formed by breaking up of rocks
  3. 4. I grow on hills. You like me when hot
  4. 6. Potters use me to make pots and toys