SUBJECTS

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Across
  1. 2. it's a subject that studies the life
  2. 4. it's a subject that uses numbers
  3. 6. it's a subject that helps us exercising
  4. 7. it's a subject that studies the earth
Down
  1. 1. it's a subject that studies the grammar
  2. 3. it's a subject that studies the environment
  3. 5. it's a subject that studies the past