1. PHYSICAL AND HUMAN GEOGRAPHY

2. NATURAL HAZARDS  CHALLENGES FOR HUMAN ACTIVITIES.  NATURAL HAZARD IS A NATURAL EVENT THAT CAUSES DAMAGE TO PROPERTY, DISRUPTION TO NORMAL LIFE AND MAY CAUSE LOSS OF LIFE.  CAUSED BY IMPACT OF NATURAL EVENTS ON SOCIAL AND ECONOMIC DEVELOPMENT.

3. NATURAL HAZARD  RAPID INCREASE IN POPULATION  URBANISATION (Including shanty towns)  CHANGING LAND USE IN RURAL AREAS  NUMBER OF PEOPLE IN POVERTY  CHANGING NATURAL ENVIRONMENT

4. TECTONIC HAZARDS  CAUSED BY PLATE MOVEMENT

5. TROPICAL STORMS  WINDS, FLOODS AND STORM SURGES.  HURRICANES ARE KNOWN AS TROPICAL CYCLONES.

6. TROPICAL STORMS  Tropical cyclones are like giant engines that use warm, moist air as fuel. That is why they form only over warm ocean waters near the equator. The warm, moist air over the ocean rises upward from near the surface. Because this air moves up and away from the surface, there is less air left near the surface.  Air from surrounding areas with higher air pressure pushes in to the low pressure area. Then that "new" air becomes warm and moist and rises, too. As the warm air continues to rise, the surrounding air swirls in to take its place. As the warmed, moist air rises and cools off, the water in the air forms clouds. The whole system of clouds and wind spins and grows, fed by the ocean's heat and water evaporating from the surface

7. TROPICAL STORMS

8. FLOODS  RESULT OF TROPICAL STORMS  CONTINUOS RAIN  LOCATION OF SETTLEMENT  COASTAL FLOODING. HIGH TIDAL RANGE.

9. FLOODS  BANGLADESH

10. FLOODS IN BANGLADESH  3 LARGE RIVERS:  GANGES, BRAHMAPUTRA AND MEGHNA.  MONSOON RAINS  AVERAGE OF 16 CYCLONES PER YEAR  80% OF POPULATION LIVE IN RURAL AREAS  HIGHEST RAINFALL TOTALS IN THE WORLD  POPULATION GROWTH AND RURAL IMPOVERISHMENT

11. FLOODS IN BANGLADESH

14. DROUGHT  EXTENDED PERIOD OF DRY WEATHER LEADING TO CONDITIONS OF EXTREME DRYNESS.  ABSOLUT DROUGHT: 15 CONSECUTIVE DAYS WITH LESS THAN 0.2 MM OF RAINFALL.  PARTIAL DROUGHT: 29 CONSECUTIVE DAYS WHERE AVERAGE DAILY RAINFALL DOES NOT EXCEED 0.2 MM.  FOREST FIRES  FOOD SHORTAGES

15. DROUGHT

16. RAINFOREST  OPPORTUNITIES: FARMING HYDRO-ELECTRIC POWER TOURISM FISHING MINERAL DEVELOPMENT

17. RAINFOREST

20. REAINFOREST  HAZARDS: SURFACE EROSION SANDIFICATION CLIMATIC CHANGE LOSS OF BIODIVERSITY

21. DESERTS

22.  HAZARDS: WEATHERING FLOODING EROSION LANDSLIDES AND ROCKFALLS DUST STORMS

23. DESERTS

24. UNIT 2. LANDFORMS AND LANDSCAPE PROCESSES  WEATHERING: Decomposition (chemical breakdown) and disintegration (physical breakdown) of rocks in situ. Decomposition refers to the chemical process which creates altered rock substances. Disintegration produces smaller angular fragments of the same rock.

25. PHYSICAL WEATHERING  FREEZE-THAW

26. PHYSICAL WEATHERING  SALT CRYSTAL GROWTH:

27. PHYSICAL WEATHERING  DISINTEGRATION

28. PHYSICAL WEATHERING  PRESSURE RELEASE