CROSS Out the WORDS with the Information Provided By the Definitions and Clues (aka: Maryam's Puzzle)

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Across
  1. 1. a collection of stars, dust, and gas bound together by gravity
  2. 4. describes living factors in the environment
  3. 6. a relationship between two species in which both species benefit
  4. 7. an object so massive and dense that even light cannot escape its gravity
  5. 10. the change of a substance from a liquid to a gas
  6. 11. all of the populations of species that live in the same habitat and interact with each other
  7. 13. a gradual increase in average global temperature (hint: this is one of the reasons for global warming)
  8. 15. the change of state from a liquid to a gas
  9. 18. the rate at which charges pass through a given point; measured amperes
  10. 20. an event in which the shadow of one celestial body falls upon another
  11. 22. the shallow zone of a lake or pond where light reaches the bottom and nurtures plants
  12. 23. the distance that light travels in one year
  13. 26. a natural or artificial body that revolves around a panet
  14. 28. the change in the sunlit area of one celestial body as seen from another celestial body (hint: the moon goes through phases called___)
  15. 29. the amount of water vapor in the air
  16. 30. the energy transferred between objects that at different temperatures (hint: something we long for during the winter)
Down
  1. 2. a mixture of gases that surrounds a planet or moon
  2. 3. the part of Earth where life exists
  3. 5. the time required for Earth to rotate once on its axis
  4. 8. an instrument used to measure wind speed
  5. 9. the apparent curving of the path of a moving object from an otherwise straight path due to the Earth's rotation
  6. 12. a diagram that shows the feeding relationships between organisms in an ecosystem
  7. 14. a tide of minimum range that occurs during the first and third quarters of the moon
  8. 16. the region of the solar system that is between the orbits of Mars and Jupiter and in which most asteroids orbit
  9. 17. a streamlike movement of ocean water far below the surface
  10. 19. a treeless, wetland ecosystem where plants such as grasses (hint: it's not a biome and it's not a swamp)
  11. 21. a nonrenewable energy resource formed from the remains of organisms that lied long ago (hint: it has a FORM of ENERGY)
  12. 24. a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune
  13. 25. a bright streak of light that results when a meteoroid burns up in the Earth's atmosphere (hint: people think that it's a shooting star)
  14. 27. a large region characterized by a specific type of climate and certain types of plant and animal communities