If there are more people living in an area or a certain type of area, it is more likely that more people will be affected by a

Natural disaster.

Explanation:

A natural disaster can be defined as a natural occurrence beyond human control and it is typically characterized by injuries, death or damage to both the living and non-living organisms such as humans, animals, plants or properties staying within the environment. Therefore, a natural disaster is capable of endangering the lives of the people living in a susceptible area, as well as causing damages to buildings, cars, trees, etc.

Some examples of natural disaster are earthquake, tornado, flood, wildfire, volcano, etc.

The higher the number of people and properties in an area prone to natural disasters, the higher (greater) would be its impact.

Hence, if there are more people living in an area or a certain type of area, it is more likely that more people will be affected by a natural disaster.