Crossword 1

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Across
  1. 2. (A subatomic particle with no charge found in the nucleus of an atom.)
  2. 3. (The branch of biology that deals with the structure and function of macromolecules.)
  3. 6. (The type of reaction that powers the sun.)
  4. 9. (The scientific study of matter and energy.)
  5. 10. (The study of diseases in humans.)
  6. 12. (The study of fossils and ancient life forms.)
  7. 19. (The branch of physics concerned with heat and temperature.)
  8. 20. (Study of heredity and variation in organisms.)
  9. 21. (The study of the human mind and behavior.)
  10. 24. (The most abundant gas in the Earth's atmosphere.)
  11. 25. (The smallest unit of an element that retains its chemical properties.)
  12. 28. (The study of the structure of living organisms.)
  13. 29. (The process by which plants convert sunlight into energy.)
  14. 30. (The positively charged particle in the nucleus of an atom.)
  15. 31. (The scientific study of plant life.)
  16. 32. (The branch of geology that studies layers of rocks and earth.)
  17. 34. (The scientific study of the human body and its systems.)
  18. 36. (The branch of biology dealing with microorganisms.)
  19. 37. (The science of classifying organisms.)
  20. 38. (A subdiscipline of biology focusing on animals.)
Down
  1. 1. (A negatively charged subatomic particle.)
  2. 2. (The center of an atom.)
  3. 4. (The energy possessed by an object due to its motion.)
  4. 5. (The study of light and its properties.)
  5. 7. (The study of fungi.)
  6. 8. (The study of the physical and chemical properties of matter.)
  7. 11. (A type of rock formed from cooled magma or lava.)
  8. 13. (The science of numbers and their operations.)
  9. 14. (The planet closest to the Sun.)
  10. 15. (The outermost layer of the Earth's atmosphere.)
  11. 16. (A type of bond formed by the transfer of electrons.)
  12. 17. (The process by which an organism maintains a stable internal environment.)
  13. 18. (The fundamental unit of life.)
  14. 20. (A force of attraction between two masses.)
  15. 22. (A naturally occurring solid aggregate of minerals.)
  16. 23. (The type of bond where atoms share electrons.)
  17. 26. (The study of the universe and its origins.)
  18. 27. (The study of the Earth's atmosphere, especially weather and climate.)
  19. 33. (The study of earthquakes and seismic waves.)
  20. 35. (A change in the DNA sequence of an organism.)