Natural calamities is that what be happened abnormal phenomena , natural calamities sometimes are horrifying in Nature that human being is dependent on to damage brought about by human society. In them now that have earthquake , volcanic eruption , mud-rock flow , seaquake , stage manner , flood etc. to dash forward sending out the nature disaster; Also have surface subsidence , land desertification, are arid , coastline change waits for gradient disaster appearing gradually in more longtime middle ability; Still have the environment disasters that the human being activity leads to such as ozonosphere change , water body pollution , loss of soil and water , sour rain. These have complicated mutual connection between natural calamities and environmental disruption. Occurrence that human being asks to know these disasters on the significance from science
