The presence and absence of ­­­­­­______ has various effects of
matter. Common examples are _______ and ______. Fire will
continue its flame provided that there is continuous supply of
_____, _______, and ________. In the absence of oxygen,
there will be no ________ that will occur. An example of
change in the material when oxygen is present is rusting.
_______ is formed when iron and oxygen react with water or
air moisture.



choices: burning
rust
fire/flame
oxygen
heat
fuel
combustion