Oil & Natural Gas Puzzle

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Across
  1. 2. What we breathe (it's invisible)
  2. 6. Things that are made in one country and sold to another country
  3. 7. A long tube that carries oil or gas from one place to another
  4. 9. Things like machines or computers that make our lives easier or better
  5. 13. The act of looking for new places (like sites for oil and gas drilling)
  6. 14. Something that is burned to make heat or energy
  7. 15. Everything around us, like plants, animals, and weather
Down
  1. 1. The act of changing or improving something
  2. 3. A person who learns about rocks, minerals, and the history of the Earth
  3. 4. A clear liquid that we drink and use to clean things
  4. 5. A person who makes or fixes machines
  5. 8. The word for when something catches fire
  6. 10. gas A fuel that is used to keep houses warm or cook food
  7. 11. A black liquid that comes from underground
  8. 12. A place where oil is turned into different products like gasoline