Question

How fire started ? Could it be avoided ? Explain if yes how

Answer 1

 fire needs three things: fuel, oxygen and heat. Firefighters often talk about the fire triangle when they're trying to put out a blaze.

The idea is that if they can take away any one of those elements they can control and ultimately extinguish the fire.

On a hot summer's day when drought conditions peak, something as small as a spark from a train wheel striking the track can ignite a raging wildfire. Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike

Answer 2

Fire was first discovered by cavemen while they were making stone weapons by curving two stones together.
Yes,fire can be avoided.
To avoid water,spread water over it or spread mud or place a blanket over the source of fire.