Science Grade 9 Units

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Across
  1. 2. amount of mass in a given volume
  2. 3. harmful substances introduced into the eenvironment from human activities
  3. 4. celestial bodies that orbit a star, with a sphericl shape
  4. 5. grassland ecosystem found in North America
  5. 10. vast gravitationally bound system that consists of stars,stellar remmenants,etc
  6. 11. electrically charged atom that plays a role in chemical reactions
  7. 13. consists of sun,eight planets,ans their moons, dwarf planets, etc
  8. 15. the way water moves around the earth
  9. 17. subatomic particle with a positive charge
  10. 18. a community of living and non living organisms that interact with each other
  11. 22. subatomic particle with a negative charge
  12. 23. anything related to or living on earth
  13. 26. electrical potential energy per unit charge (V)
  14. 27. current flows through a path of resistance
  15. 28. a model that shows how different organisms in an ecosystem interact through their feeding relationships
Down
  1. 1. creates electric current in a conductor
  2. 6. measured in Ohms and represents the oppostion that an electrical component uses
  3. 7. a pure substance made with one atom
  4. 8. subatomic particle with no charge
  5. 9. property of matter that descibes the amount of electrical energy present
  6. 12. a graph of intensity of light emmitted by the star at different wavelengths
  7. 14. a natural satalite of the Earth
  8. 16. the rate at which something is transferred or converted, measured in watts
  9. 19. a closed loop of conductive material that allows electric current to run through
  10. 20. a massive luminous ball of plasma held together by gravity
  11. 21. buildup of electric charge on a materials surface
  12. 24. occurs when one celestial body passes in front of another, making a shadow and blocking views
  13. 25. large reions of Earth's surface that have similar climate, vegetation, and animal life