A. Give the definitions of the following:

1. Dendrochronology:
2. Cambium Layer:
3. Xylem:
4. Phloem:
5. Greenhouse Effect:
6. Greenhouse Gases:
7. Ozone:
8. Ground-Level Ozone:
9. Upper-Level Ozone:
10. Ultraviolet Radiation:
11. Ozone Hole:
12. UV Index:
13. Radiation:
14. Electromagnetic Spectrum:
15. Conduction:
16. Convection and Advection:
17. Albedo:
18. Heat Sink:
19. Heat Capacity:
20. Specific Heat Capacity:
21. Convective Clouds:
22. Frontal Clouds:
23. Orographic Clouds:
24. Fog:
25. Stratus Clouds:
26. Cumulus Clouds:
27. Cirrus Clouds:
28. Hydrosphere:
29. The Water Cycle:
30. Atmosphere:
31. Troposphere:
32. Tropopause:
33. Stratosphere:
34. Mesosphere:
35. Thermosphere:
36. Exosphere:
37. Temperature Gradient:
38. Atmospheric Pressure:
39. Pressure Gradient:
40. Aneroid Barometer:
41. Wind:
42. Prevailing Winds:
43. The Coriolis Effect:
44. Jet Stream:
45. Saturated Air:
46. Dew Point:
47. Dew:
48. Humidity:
49. Absolute Humidity:
50. Relative Humidity:
51. Psychrometer:
52. Precipitation:
53. Hail:
54. Drizzle:
55. Rain:
56. Freezing Rain:
57. Ice Pellets (Sleet):
58. Snow:
59. Weather System:
60. Air Mass:
61. Low-Pressure Systems:
62. Front:
63. Warm Front:
64. Cold Front:
65. Occluded Front:
66. Cyclone:
67. Cyclogenesis:
68. Stationary Fronts:
69. Anticyclone:
70. Thermal:
71. Sea Breeze:
72. Land Breeze:
73. Lake-Effect Snow:
74. Chinook Winds: