a)
1 EXPLOSION 2 POLLUTION 3 VOLCANIC ERUPTION 4 FLOOD 5 FAMINE 6 TORNADO 7 TSUNAMI 8 FOREST FIRE 9 HURRICANE 10 DROUGHT 11 DISEASE 12 WAR 13 EARTHQUAKE

b) 1-H (WAR) 2-M (FAMINE) 3-C (POLLUTION 4-F (DROUGHT) 5-I (VOLCANIC ERUPTION) 6-A (DISEASE) 7-L (FLOOD) 8-D (FOREST FIRE) 9-G (TSUNAMI) 10-B (TORNADO) 11-E (EXPLOSIONS) 12-K (EARTHQUAKE) 13-J (HURRICANE)