EARTH'S CHANGING ENVIRONMENT

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