Fill in the blanks:
1. Hazards can be broadly classified into ……. types
2. Smog is a serious problem in most ……. areas.
3. The beginning of ……. century, the earth supported a human population.
4. The meaning of old french “Hazards” …….
5. A catastrophe was recover ……. time.
6. ……… can disturb the safety health, welfare of people.
7. ……. is a violent tremor in the earth’s crust.
8. ..…. percentage of carbon di oxide present in the air.
9. ……. percentage of oxygen present in the air.
10. ……. nuclear accident took place in 26th April 1986
