ELi5 How does forest or grassland catch fire, does it always need a spark or can drying out cause spontaneous combustion?

Question

ELi5 How does forest or grassland catch fire, does it always need a spark or can drying out cause spontaneous combustion?

In: 3

Answer 1

Fire needs an ignition source. Lightning strikes, embers from a campfire, or even a vehicle’s exhaust system can all ignite a fire in a suitable environment.