Amelia's Awesome Acrostic

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Across
  1. 2. There are seven of these
  2. 3. The vertical imaginary line
  3. 7. Abbreviation for a famous mountain range
  4. 9. One of the most feared landforms
  5. 10. A big part of geography
  6. 11. Travelers
  7. 12. Before people wrote things down
Down
  1. 1. A piece of land surrounded by water on three sides
  2. 4. The horizontal imaginary line
  3. 5. To tame
  4. 6. A ring of islands
  5. 8. A piece of land with endless fields of grass