How does the united nations define disaster management

A disaster is a serious disruption to the functioning of a community, which causes human, material, economic and environmental losses beyond a community's ability to cope. Disaster management aims to lessen the impacts of disasters, minimizing losses of life and property.

c-flooding of the area and the development of wetlands.

tell me if im wrong.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.