Elements of Earth 2

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Across
  1. 2. the smallest unit of an element
  2. 3. which element is needed for strong teeth and bones
  3. 7. a metalloid found in abundance in the lithosphere
  4. 10. is 21% of the atmosphere
  5. 11. the gasses surrounding Earth held in place by gravity
  6. 12. these are on the periodic table
  7. 13. two or more different types of atoms chemically combined
  8. 16. the fresh water and salt water of Earth
  9. 17. the solid part of Earth
  10. 19. this element makes up about 21% of the atmosphere
Down
  1. 1. the living parts of the Earth system
  2. 4. light reflects off of the surface of a material
  3. 5. this element is found in all four parts of Earth's systems
  4. 6. breaks easily when put under pressure
  5. 8. is a poisonous gas that is fatal if inhaled
  6. 9. dull, poor conductor, brittle
  7. 14. the most abundant element of the atmosphere
  8. 15. the number that tells how many protons are in the atom
  9. 18. shiny, malleable, good conductor