Earth Science Unit 1 Review

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Across
  1. 2. Force of attraction
  2. 5. The gradual changing of ecosystems
  3. 7. Type of large planet that is made mostly of hydrogen and helium
  4. 10. _____ flows through a system
  5. 11. Type of large planet that is made mostly of nitrogen, carbon, oxygen, and sulfur
  6. 14. Ribbons of green to red light formed when solar winds hit the earth’s magnetic field.
  7. 15. The earth is found in a ___ of the Milkey way galaxy
  8. 16. Semi-molten, plastic layer beneath the lithosphere
  9. 20. Fourth planet from the sun
  10. 22. Type of galaxy with older stars and little dust left
  11. 23. All of the water on earth (97% saltwater and 3% freshwater!)
  12. 25. Seasons are caused by the ____ of the planet
  13. 28. Process by which plants convert carbon dioxide and water into food using sunlight
Down
  1. 1. Most common element
  2. 3. All the non-living things in an ecosystem
  3. 4. Type of planet with a solid surface
  4. 6. Collection of billions of stars and their planets
  5. 8. Area of space with lots of hydrogen-- where stars are likely to form
  6. 9. All the living organisms on the planet
  7. 12. The earth represents a ___ system
  8. 13. How light and energy travel through space
  9. 17. Type of galaxy with younger stars and lots of space dust
  10. 18. Dwarf planet that used to be the ninth planet from the sun
  11. 19. Matter ____ through a system
  12. 21. Instead of using light, ____ uses hydrogen sulfide to produce food
  13. 24. Like a planet, but smaller and has other space objects in its orbit path
  14. 26. Transition from earth’s atmosphere to space helps block solar radiation
  15. 27. all the living things in an ecosystem