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Across
  1. 4. Trees that lose their leaves in fall.
  2. 5. Event when multiple meteors are observed.
  3. 6. Measure of heat.
  4. 9. Seasonal movement of animals.
  5. 11. Process by which plants make food using sunlight.
  6. 14. Changes in weather and daylight.
  7. 16. Our planetary system.
  8. 18. Period of dormancy in animals.
  9. 19. Climate conditions at a particular time and place.
Down
  1. 1. Breakdown of organic matter.
  2. 2. Study of weather and climate.
  3. 3. Layer of gases surrounding Earth.
  4. 7. Regions of Earth where life exists.
  5. 8. Community of living organisms.
  6. 10. Material that retains heat.
  7. 12. Force that attracts objects toward one another.
  8. 13. Leaves of trees and plants.
  9. 15. Large system of stars.
  10. 17. Green pigment in plants.
  11. 20. Time when day and night are of equal length.