Reading 3

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Across
  1. 3. a decrease in value or amount
  2. 5. a large flat area of land without trees in very cold northern parts of the world
  3. 9. become larger, or to make something become larger
  4. 10. to gradually change behavior in order to become successful
  5. 11. a circle that divides a sphere or other surface into two equal parts
  6. 12. a structure such as a fence that is intended to prevent access or keep one place separate from another
  7. 13. fairly large area of a state or country, usually without exact limits
Down
  1. 1. not expected to change;steady
  2. 2. land and sea areas with their unique plants, animals, water, and air
  3. 4. a group of similar plants or animals living together
  4. 6. scattering or spreading of something over an area
  5. 7. a kind, sort, or variety of something
  6. 8. move from one place to another