Unit 30 word review

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Across
  1. 2. something you learn in school
  2. 5. all the things that happened in the past
  3. 6. learn abo0ut electricity and energy in this lesson
  4. 8. learn about people, plants and animals
Down
  1. 1. the study of the countries of the world
  2. 3. learn about things called chemicals
  3. 4. the study of numbers and shapes
  4. 7. knowing things from studying nature