a natural disaster is defined as a natural hazard，which has a negative effect on human beings.though some of the natural disasters are geological，many of them are due to changes in the climatic conditions.given below are some of the very important natural disasters. blizzard(暴风雪) a severe winter storm is known as a blizzard.strong winds，heavy snowfall and low temperatures characterize a blizzard.a blizzard that occurred in 1888 killed over 400 people in the northeastern states.this blizzard is known great blizzard of 1888. flood
