year 8 science crossword

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Across
  1. 2. the corrosion of iron
  2. 4. a stretching force
  3. 5. the wearing away and removal of soil and rock by natural elements
  4. 6. describes chemicals that are damgerous to touch inhale or swallow
  5. 12. describes a chemical that wears away the surface of a substance
  6. 13. a substance made up of two or more different types of atoms that are chemically bonded
  7. 14. the smallest unit of life
  8. 15. a mixture in which solid substances do not dissolve and dispersed throughout the volume of the liquid
Down
  1. 1. the hard and thin outer rock layer of earth
  2. 3. materials broken down by weathering and erosion that is moved by wind water and collects in layers
  3. 7. the process of combining with oxygen, most commonly burning with flames
  4. 8. very small particles that make up of al things
  5. 9. the rubbing together of surfaces
  6. 10. peices of hard tissues that make up the skeleton of a vertabrate
  7. 11. elements that conducts heat and electricity