Checkpoint #2 Vocab Review

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Across
  1. 4. Differences among individuals in a population
  2. 7. Substance made of only one type of atom
  3. 9. Early stage in a star’s formation
  4. 13. Exploding massive star at the end of its life
  5. 14. Type of reproduction producing identical offspring
  6. 17. Variety of species in an ecosystem
  7. 19. Process where atoms rearrange
  8. 20. Layer of gases surrounding Earth
  9. 21. Smallest unit of an element
  10. 22. Caused by uneven heating of Earth’s surface
Down
  1. 1. A rotating storm system with low pressure
  2. 2. Plants converting light to chemical energy
  3. 3. Amount of matter in an object
  4. 5. Trait that helps organisms survive
  5. 6. Breaks down dead organisms
  6. 8. Large system of stars, gas, and dust
  7. 10. Cloud of gas and dust where stars form
  8. 11. Drives energy for weather and climate
  9. 12. Warming of Pacific Ocean affecting weather
  10. 15. Gradual change in ecosystems over time
  11. 16. Our home galaxy
  12. 18. Levels in a food chain