Across
- 3. The change from gas to liquid.
- 6. A protein that speeds up chemical reactions in the body.
- 10. Spreading apart (e.g., light rays through a concave lens).
- 12. The gradual destruction of materials by chemical reaction.
- 14. Coming together (e.g., light rays through a convex lens).
- 17. The new substances formed in a chemical reaction.
- 18. The process of sediments sticking together to form rock.
- 19. Allows some light to pass through but not clearly.
- 21. The distance between two wave crests.
- 25. change of energy from one form to the other.
- 28. The starting substances in a chemical reaction.
- 29. rock formed from heat and pressure on other rocks.
- 31. A measure of the average kinetic energy of particles.
- 33. Does not allow light to pass through.
- 36. The process of breaking down food into nutrients.
- 37. The change from liquid to gas at the surface.
- 42. Warming that results when gases trap heat in the atmosphere.
- 45. A blood vessel that carries blood to the heart.
- 47. Transfer of heat through direct contact.
- 48. An element that is shiny, malleable, and conducts heat.
- 49. The movement of particles from high to low concentration.
- 51. Bouncing of light off a surface.
- 55. The ability to do work.
- 56. The process where nutrients pass into the bloodstream.
- 57. A mixture of metals.
- 59. Allows light to pass through clearly.
- 61. rock formed from layers of sediment.
Down
- 1. Squeezing of sediments by pressure.
- 2. A lens or mirror that curves outward.
- 4. Material used to reduce heat transfer.
- 5. The act of taking food into the mouth.
- 7. Two or more atoms bonded together.
- 8. energy Stored energy due to position.
- 9. A substance that provides nourishment for growth.
- 11. Mass per unit volume.
- 13. A lens or mirror that curves inward.
- 15. A harmful substance released into the environment.
- 16. energy Energy of motion.
- 20. Transfer of heat through fluids (liquids or gases).
- 22. The total area that the surface of an object occupies.
- 23. rock formed from cooled magma or lava.
- 24. Allows liquids or gases to pass through.
- 26. A chemical reaction between a fuel and oxygen.
- 27. Bending of light as it passes from one medium to another.
- 30. The process of releasing energy from food.
- 32. A blood vessel that carries blood away from the heart.
- 34. The basic unit of a chemical element.
- 35. A naturally occurring solid with a crystal structure.
- 38. Contains tiny holes that allow water or air to pass.
- 39. A type of corrosion that occurs with iron.
- 40. A substance made of two or more elements chemically joined.
- 41. Breaking down of rocks into smaller pieces.
- 43. Movement of rock particles by wind or water.
- 44. Force that pulls objects toward each other.
- 45. An outer shell electron that can form chemical bonds.
- 46. Transfer of energy through electromagnetic waves.
- 50. A material that releases energy when burned.
- 52. Wearing down of rock by friction.
- 53. The movement of air in and out of the lungs.
- 54. Type of respiration that uses oxygen.
- 58. A pure substance made of only one kind of atom.
- 60. Thermal energy transferred between objects.