Prahlad's Crossword

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Across
  1. 1. to compare something to a standard unit
  2. 3. matter that does not have a definite shape or volume
  3. 4. a natural material made from one or more minerals
  4. 7. harmful substances in the environment
  5. 8. matter with a definite volume but no definite shape
  6. 9. a force that pull to objects together
Down
  1. 1. the amount of matter in an object
  2. 2. a giant ball of hot, glowing matter
  3. 5. all organisms living in a ecosystem
  4. 6. matter with a definite shape and volume