 There are two systems when we are dealing with the earth environment. The first belongs to the physical system and second belongs to the human system. The first the physical environmental system deals with the things which are related to the natural environment. Now, the like we have the climatic condition, the relief features, the soil cover, the vegetal cover. So, these are actually the natural environmental system. So, when we are dealing with the human environmental system, these are actually related with the human economic and commercial activities. So, there are certain things which are related to the environmental nature environment. And when we are dealing with the nature environment, it has certain component which has impact on the enclosed environment. It not only impact on the local, but it has regional scale and global scale as well. So, today we discuss what is hazard. So, when we are dealing with the hazard, it is actually the environmental component. Natural hazard or environmental hazard is the state of events which has the potential to threaten the surrounding nature environment and adversely affect people's health. So, in this, we can give an example. So, the earthquake is a natural phenomenon. Its physical component, we face in the form of an earthquake. And its impact is not only on the local, but also on the regional impact. Local is in a way. The place where the earthquake has happened, there are more deaths and there are more economic losses. But if we talk about regional, when the wave moves, it moves from one place to another. Even at the end of this globe, we see that the other part of it is also on the Richter scale. We feel some of its trembling. So, it has a global impact, a regional impact, and a local impact. Now, it is not only discussing the deaths or the economic losses of the hazard, but when we are dealing a hazard, it is a situation that poses a level of threat to life, health, property, and environment. Now, not only the environment, we see that there have been changes. For example, on the 1st of October, 8th of October, in 2005, we see that the upper layer of the mountain environment has also changed. And even near Balakot in the area of Kashmir, a new lake was also discovered there. Similarly, we see its impact in the form of the Atabah Lake. When it was trembling in 2005, the upper layer or the upper surface of the mountain was loosened and the sediment was quite loose. And in this way, when the 2nd earthquake or aftershocks came, it changed the course of the river in the sense of the landslide layer. In fact, today we see it in the form of the Atabah Lake. So actually, it has not only the impact on the physical features or the physical environment, but we see that it also had an impact on the health of the people. There was a disability, even the debris there caused lung and throat diseases and skin cancer as well. So these are actually related to the human environment. We see property as well as economic losses, commercial losses, that is, road networks have ended and there is still a huge impact on their trade. Now, once a hazard becomes active, it can create an emergency situation. A hazard situation that has come to pass is called an accident or we can say incident. Now, we take the sense of an incident that when that incident happened, then after that incident, we see its impact in its enclosed environment. And in that enclosed environment, we see the sense of emergency, we become active in it. That is, during disaster or during hazard, we take action. And then after hazard, our role in which reconstruction, rehabilitation starts. So it means that society is also involved in this.