Question

heavy rain:floods::earthquake:?​

Answer 1

I think it is....

destruction/ death

Answer 2

Here since there is no question, it is assumed that one has to find out the odd man out. Here earthquake will be the odd man out since heavy rain and flood are linked with each other.

Heavy rain can cause floods and so it is linked directly linked to it.  

On the other hence we can consider both earthquake and heavy rain as the reason behind blood.

Due to earthquake the bottom of the river swells up which leads to flood. O

n the other hand heavy rain also caused flood.  

So the links between this trio can be set like this.