environment, technology, exploration

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Across
  1. 3. The usual weather of a place over a long time.
  2. 6. A very large body of salt water.
  3. 8. Harmful substances that make air, water, or land dirty.
  4. 9. A trip from one place to another.
  5. 11. The use of science to create useful tools and machines.
  6. 13. A drawing that shows places and directions.
  7. 15. The natural world around us.
  8. 16. Things that are no longer needed and are thrown away.
  9. 18. The part of a device where images and information appear.
  10. 19. A global network that connects computers.
  11. 20. Using computer technology.
Down
  1. 1. To use materials again instead of throwing them away.
  2. 2. An object that moves around a planet and sends information.
  3. 4. To travel and learn about a new place.
  4. 5. An electronic machine that processes information.
  5. 7. A machine that can do tasks automatically.
  6. 10. A person who travels to discover new places.
  7. 12. Plants, animals, and landscapes that are not made by people.
  8. 14. A large area covered with trees.
  9. 17. A piece of equipment made for a particular purpose.