Oregon Trail

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Across
  1. 5. a pair of draft animals fastened together by a yoke
  2. 7. a crack forming an opening
  3. 8. an extremely plentiful or over-sufficient quantity or supply
  4. 9. a person who emigrates, as from his or her native country or region
  5. 10. a dark, heavy soil, containing clay
  6. 11. a written message; letter
Down
  1. 1. a stream of water flowing with great rapidity and violence
  2. 2. a narrow steep-sided valley commonly eroded by running water
  3. 3. pleasant to be with
  4. 4. the small, edible, acid, round fruit or berry of certain wild or cultivated shrubs of the genus
  5. 6. obviously; apparently