Revision for school

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Across
  1. 1. Identified and given meaning by people
  2. 4. Matter that keeps the same volume and changes shape.
  3. 8. Geographical concept to do with different levels.
  4. 11. Keeping the Earth and it's resources for future generations
  5. 12. A 90 degree angle
  6. 13. The distribution of things on Earth
Down
  1. 2. An angle less than 90 degrees
  2. 3. Warm blooded animals
  3. 5. positive + negative is a...
  4. 6. cold blooded animals
  5. 7. Rigid state of matter
  6. 9. negative plus negative is a...
  7. 10. matter that flows through the air
  8. 14. A many-sided shape
  9. 15. Differences in an environment over time.