EARTH'S CHANGING ENVIRONMENT

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Across
  1. 4. HARMFUL TO PEOPLE AND OTHER LIFE ON EARTH
  2. 8. STUDY OF EARTH AND ITS POSITION IN THE UNIVERSE
  3. 9. A MEASUREABLE PART OF THE ENVIRONMENT
  4. 10. AN INSTRUMENT USED TO AID IN OBSERVATIONS
  5. 12. A FORM OF MATTER COMMON ON EARTH
  6. 13. THE DISTANCE BETWEEN TWO POINTS
  7. 14. WHAT IS LESS DENSE AS A SOLID THAN A LIQUID
  8. 15. THE CONCENTRATION OF MATTER IN AN OBJECT
  9. 16. A SENSE WHERE WE GATHER INFORMATION
  10. 17. THE DURATION OF AN EVENT
Down
  1. 1. A PATTERN TO AN EVENT IN NATURE
  2. 2. WHEN PROPERTIES OF THE ENVIRONMENT HAVE BEEN ALTERED
  3. 3. THE AMOUNT OF SPACE AN OBJECT MAKES UP
  4. 5. WHEN A CHANGE OCCURS IN A SYSTEM
  5. 6. TYPE OF INFERENCE ABOUT THE CONDITIONS OF THE ENVIRONMENT
  6. 7. THE AMOUNT OF MATTER IN AN OBJECT
  7. 11. SUBSTANCE THAT CAUSES POLLUTION