Because fuel is a FLAMMABLE material.
Heat fuel and oxygen
To make a fire, you need three main things: fuel, heat, and oxygen. Fuel can be anything that burns, like wood or paper. Heat is necessary to ignite the fuel and start the fire. Oxygen is needed to sustain the combustion process.
heat,oxygen,fuel source
The three things needed to make a fire burn, what is called the Fire Triangle, are 1] oxygen 2] heat 3] fuel
Because more oxygen is needed for fuel for fire.
To make fire, you need three things: fuel to burn, heat to ignite the fuel, and oxygen to sustain the combustion reaction. These three components combine to create a self-sustaining chemical reaction known as fire.
Fuel, oxygen and heat or an ignition source are the components needed for a fire.
Heat, fuel and oxygen
If you remove one of the three things needed to make a fire (fuel, heat, or oxygen), the fire will not be able to sustain itself and will go out. These components work together in a fire triangle to create and maintain a flame.
Combustible or burnable fuel, heat or spark, and oxygen are needed to start a fire.
Fuel, air, and a temperature high enough to ignite the fuel.
Fuel, Oxygen and a heat source. Fuel, Oxygen and heat are everywhere why is the whole earth not on fire? because it is not Heat but a source of ignition that is needed.