unit4

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Across
  1. 3. A collection of information stored in a computer
  2. 6. A set of connected parts that work together
  3. 7. To keep someone or something safe from harm or damage
  4. 9. To give something to someone that they need or want
  5. 11. Having a large distance from one side to the other
  6. 12. Extremely cold
  7. 14. A substance like air that is not solid or liquid
  8. 18. To move air or be moved by air
  9. 20. A light, strong material made from chemicals, used to make many things
  10. 21. To be able to get to a place or touch something
  11. 23. A small hard seed of food plants like wheat or rice
  12. 25. Belonging to or done by a particular person or thing
  13. 26. A strong wind that carries a lot of sand through the air
  14. 29. To travel to or through a place to learn about it
  15. 30. The direction where the North Pole is located
  16. 32. A state of fighting between countries or groups
  17. 35. A way of solving a problem or dealing with a difficult situation
  18. 36. Either of the two ends of a planet (like the Earth)
  19. 37. A set of pages of information on the Internet about a particular subject
Down
  1. 1. All the people born and living at about the same time
  2. 2. The male ruler of an empire
  3. 4. A substance made by or used in a chemical process
  4. 5. A small insect with colorful wings that flies during the day
  5. 8. A very large sea animal that breathes air through a hole on top of its head
  6. 9. Harmful substances that make air, water, or land dirty
  7. 10. A thick liquid that comes from under the ground and is used as fuel
  8. 13. Water that is under the surface of the ground
  9. 15. A particular part of a place, country, etc.
  10. 16. The number 1,000,000,000
  11. 17. To be on fire or to make something on fire
  12. 19. To put something over or on top of something else
  13. 22. To chase and kill animals for food or sport
  14. 24. Causing great surprise or wonder
  15. 27. A large area of land with little or no rain, plants, or people
  16. 28. A unit of length equal to 100 centimetres
  17. 31. Causing damage or injury to someone or something
  18. 33. A large round object that moves around a star (like the Sun)
  19. 34. To stop being visible or present