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