Merlin Echo Crossword

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Across
  1. 6. Relating to the moon
  2. 7. The speed of something in a given direction
  3. 9. The distance around the edge of a circle
  4. 10. A structure that carries water over long distances
  5. 11. The longest river in the world
  6. 12. The outer layer of the Earth
  7. 17. A type of rock formed from cooled magma
  8. 18. The process of plants making their own food
  9. 21. A transparent object that separates white light into its constituent colors
  10. 23. An object orbiting a larger celestial body
  11. 25. The liquid part of blood
  12. 27. The study of the universe beyond the Earth's atmosphere
  13. 29. The process of converting food into energy
  14. 31. The central part of an atom, containing protons and neutrons
  15. 34. The distance across a circle through its center
  16. 36. The process of changing from a liquid to a gas
  17. 37. The process of water turning into vapor
  18. 38. A large striped cat
  19. 40. A measure of the force of gravity on an object
  20. 41. A word that means the same as another word
  21. 43. A synonym for "easy"
  22. 45. A subatomic particle with no net electric charge
  23. 47. A device used for writing or drawing
Down
  1. 1. To express the meaning of words in another language
  2. 2. The measure of how hot or cold something is
  3. 3. A system of government where people elect representatives to make decisions
  4. 4. The transfer of heat through a fluid
  5. 5. A basic unit of matter
  6. 8. The study of living organisms
  7. 10. A branch of mathematics involving symbols and rules for manipulating those symbols
  8. 13. A substance that speeds up a chemical reaction
  9. 14. The resistance to motion of one object moving relative to another
  10. 15. A place where animals are kept and cared for
  11. 16. An animal that eats only plants
  12. 19. The study of Earth's physical structure and substance
  13. 20. A female parent
  14. 22. The smallest planet in our solar system
  15. 24. A substance that cannot be broken down into simpler substances
  16. 26. An instrument used to measure atmospheric pressure
  17. 27. The opposite of subtract
  18. 28. The distance around a two-dimensional shape
  19. 30. A celestial body that orbits a planet
  20. 32. A natural electrical discharge in the atmosphere
  21. 33. A long, deep crack in the Earth's surface
  22. 35. The process of wearing away or breaking down by natural forces
  23. 39. A large landmass that is smaller than a continent
  24. 42. A figure of speech comparing two unlike things without using "like" or "as"
  25. 44. The unit of currency used in Japan
  26. 46. A colorless, odorless reactive gas essential for life