Vocabulary

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Across
  1. 4. to put things in groups according their type
  2. 6. a sieve which lets through liquids and dissolved substances but not insoluble substances
  3. 7. a push or a pull that tries to change the position or shape of an object
  4. 9. That contains dissolved nitric oxides or sulfur dioxide; these compounds make the rain acidic
  5. 11. a cloudy mixture of insoluble solid particles in a liquid
  6. 13. an animal that is eaten by another animal (a predator)
  7. 15. the process of removing of waste products from the body
  8. 16. the process of breaking down food into very tiny particles
  9. 18. a particular type of plant or animal
  10. 19. the amount of force that pulls objects towards the Earth
  11. 21. to divide or split something into different parts
  12. 23. when substances are mixed together and change chemically to form a new substance
  13. 26. Special tubes that carry the blood
  14. 27. a mixture of one substance in another, where the dissolved substance can no longer be seen
  15. 30. the force that pulls objects towards the Earth
  16. 32. a way to describe the feeding relationship between plants and animals
  17. 33. cannot be changed back to what it was before
  18. 35. forms by when two or more different substances mixed together but are not chemically joined
  19. 37. the gradual increase in temperatures throughout the world
  20. 38. a living thing (usually an animal) that eats another plant or animal
  21. 39. the tube that carries air from the nose and mouth to the lungs and back again
  22. 40. removal of trees by humans
Down
  1. 1. a piece of equipment for measuring current, voltage and resistance
  2. 2. Regions with very little rainfall
  3. 3. The force caused by air pushing against moving objects
  4. 5. substances which cause pollution
  5. 8. when something has energy, it can make things move and cause things to change; all living things need energy to exist
  6. 10. The way we take air into our bodies and let it out of our bodies
  7. 12. the organ which breaks down food into tiny particles that can move into the blood; undigested food is pushed out at the end of the intestines
  8. 14. another name for air resistance
  9. 16. when a substance, often a solid, mixes with a liquid and becomes part of the liquid
  10. 17. the unit used to measure weight
  11. 20. to re-process something and make into a new product
  12. 22. a plant that produces energy from sunlight
  13. 24. can be changed back to what it was before
  14. 25. the amount of matter in an object, measured in kilograms
  15. 28. – cannot dissolve
  16. 29. a consumer that eats other animals (which are their prey)
  17. 31. the amount of energy transferred when a force makes an object move work
  18. 32. a force which tries to stop things sliding past one another
  19. 34. When two forces acting on an object are equal and opposite
  20. 36. The organ that controls all body functions
  21. 38. The pumping of blood all around the body