2. The Water Cycle

3. Each snowflake begins as a single snow crystal.

4.  A snow crystal forms in one of two ways, depending on the temperature within the cloud.

5. Each snowflake begins as a single snow crystal.  A snow crystal forms in one of two ways, depending on the temperature within the cloud. 1.At warmer temperatures, between 32˚ F and -40˚ F, a dust particle within the cloud attracts a water droplet and then the water droplet freezes into a snow crystal.

6. Each snowflake begins as a single snow crystal.  A snow crystal forms in one of two ways, depending on the temperature within the cloud. 1.At warmer temperatures, between 32˚ F and -40˚ F, a dust particle within the cloud attracts a water droplet and then the water droplet freezes into a snow crystal. 2. At colder temperatures, below -40˚ F, the water vapor condenses into an ice crystal without liquefying.

7. How is this possible?

9. Temperature

10. The warmer the air inside the cloud, the smoother the tips of the snow crystal will be.

11. Temperature The colder the air inside the cloud, the sharper the tips of the snow crystal will be.

12. Humidity

13. The dryer the air inside the cloud, the simpler the snow crystal will be.

14. Humidity The more humid the air inside the cloud, the more complex the snow crystal will be.

18. 8” x 8” Paper Scissors Standard Ruler Pencil

19. 1.

20. 2.

21. 3.

22. 4.

23. 5.

24. 6.

26. Hexagon

29. Line of Symmetry: a line that cuts an object in half so that the two halves are mirror images of each other.

31. Material Size Dimension

32. 2-Dimensional & 3-Dimensional Objects

33. Circle

34. 2-Dimensional & 3-Dimensional Objects CircleSphere

35. 2-Dimensional & 3-Dimensional Objects Square

36. 2-Dimensional & 3-Dimensional Objects SquareCube

37. 2-Dimensional & 3-Dimensional Objects Triangle

38. 2-Dimensional & 3-Dimensional Objects TriangleTriangular Prism

39. 2-Dimensional & 3-Dimensional Objects Rectangle

40. 2-Dimensional & 3-Dimensional Objects RectangleRectangular Prism

41. 2-Dimensional & 3-Dimensional Objects Hexagon

42. 2-Dimensional & 3-Dimensional Objects HexagonHexagonal Prism

43. 18 magnetic bars 12 magnetic balls

44. Does a hexagonal prism have a line of symmetry?

45. Why?

46. 1 oxygen molecule 2 hydrogen molecules

50. Do you see the similarities in shape? crystal lattice formed by frozen water molecules snowflake

51. Do you see the similarities in shape? crystal lattice formed by frozen water molecules snowflake

53. a process by which materials build themselves without assistance.

55. the manipulation of materials at the atomic or molecular level

56. 1 nanometer = 1 billionth of a meter OR 1 nanometer = 0.000000001 meters

57. the manipulation of materials at the atomic or molecular level 1 nanometer = 1 billionth of a meter OR 1 nanometer = 0.000000001 meters Example: a strand of hair is 100,000 nanometers across

58. Example 7

59. tennis balls Example 7

60. tennis balls car wax Example 7

61. tennis balls car wax stain-resistant clothes Example 7

62. tennis balls car wax stain-resistant clothes Game Boys Example 7

63. cell phones Example 7

64. cell phones flexible electronics Example 7

65. cell phones flexible electronics bandages Example 7

67. All snowflake images courtesy of www.snowcrystals.com