Southwest US

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Across
  1. 2. grassy plain with few trees
  2. 4. capital of Oklahoma
  3. 6. 2nd largest state
  4. 7. capital of New Mexico
  5. 8. capital of Arizona
  6. 9. area that gets less than 10in. of rain per year
Down
  1. 1. gradual wearing away of soil and rock
  2. 3. helped form the Grand Canyon
  3. 5. capital of Texas