New Frontiers

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Across
  1. 3. A powder that you see on a surface or in the air
  2. 4. A side of a building
  3. 7. A large flat level piece of land
  4. 9. The qualityof being strange or unexpected
  5. 11. To discover or notice something
  6. 12. Of a very great size or amount
  7. 14. An area of low land between hills or mountains
  8. 15. The gases around the earth
Down
  1. 1. The appearance of an area of land
  2. 2. A tool that is used for doing something
  3. 5. A piece of equipment that is sent around the earth
  4. 6. Relating to the most important or main part
  5. 8. A fact or a piece of information that shows something
  6. 10. A unit for measuring temperatures or angles
  7. 13. To move forward