A disaster is the seriously negative consequence of a catastrophic event that causes great losses to people, crops, animals, industries, or other valuable assets.
The idea of disaster refers to an event that causes great harm to people or the environment, generating a forced change of negative characteristics. These types of events can have a natural cause or be caused by humans.
Natural disasters are catastrophic events caused by nature or the earth's natural processes and their severity is measured in loss of life, economic loss, and the population's ability to rebuild.
This can be caused by nature itself, such as earthquakes, fire- causing lightning, an avalanche of snow, a volcanic eruption, or flooding, in which case it is called a natural disaster; or by human action, such as a fire caused by fraud or negligence that spreads over large areas. Fortunately, disasters do not happen very often, but sporadically, but they leave a terrible toll of deaths, injuries, material destruction and involve a large investment by the state.
Disasters are generally divided, according to their causes, into two categories: natural and man-made.
Natural disasters include their classification:
Hydrological disasters
They are all those disasters that occur unpredictably and caused by water, such as a flood, a tsunami, and stormy waves.
2.-Meteorological disasters
They are all those disasters that are related to the weather, these can be predicted or predicted with some advance, so it is necessary for a study to determine their behavior and the probability that they damage or damage a certain place.
3.-Geophysical disasters
They are those disasters that arise from the center of the earth or on the surface of the earth; that seriously damages the integrity and rhythm of human life. Among the disasters that belong to this group, since they occur within the planet, we can find: avalanches, landslides, solar storms, earthquakes, earthquakes, volcanic eruptions, the sinking of the earth and the limnic eruption.
4.-Biological disasters
They are all those disasters that have animal origin, because it is a healthy emergency stage that is created specifically in regions of a country and that is then expanding to other regions and neighboring countries, this develops with the introduction of a strange pathogen, This cause is the main cause as it is so contagious that it attacks a large number of animals at the same time and sets and spreads very quickly. These disasters can be found: red tide, plagues, epidemics and infections such as plague swine or bird flu.
Man-made disasters include:
• Wars: conventional war (bombing, blockade and siege) and unconventional wars (with weapons nuclear, chemical and biological)
• Civil disasters: riots and public demonstrations
• Accidents: in transportation (planes, trucks, cars, trains and boats); collapse of structures (buildings, bridges, dams, mines and others); explosions; fires; chemicals (toxic waste and pollution); and biological (health).
