What is the difference between catastrophes, disasters, and hazards?

What is the difference between Hazard, Disasters, and Catastrophes?

What is Hazard?

Any potential source of harm or event that has adverse health effects on humans and us humans comes in their way that is called hazards.

Example: Earthquakes, Volcanoes, Hurricanes, Floods.

What is Disaster? 

Any natural hazardous that occurs within limited time and defined area that is called Disaster. Disaster can scale from minor events to large-scale with widespread and severe impacts. 

When a natural Hazardous can take the Lifes of 10 or more than 10 people, impact life of more than 100 people, states announce emergency, and when that place needs international assistance, it is called Disasters. 

Example: An earthquake with lots of destruction or a volcanic eruption.

What is Catastrophe?

  Catastrophes are extreme, often unpredictable events that can cause huge destruction and severe damage. It will take a long time and money to rebuild or recover the places face catastrophe. it has large scale regional, national or even global impacts. 

Example: A mega earthquake that causing tsunamis or a super big volcano that cause global climate effect.