The presence or absence of (1)__________ has various effects on matter.
Common examples are (2)___________ and (3)_________.
Fire will continue its flame provided that there is continuous supply of
(4)_______, (5)_______, and (6)________. In the absence of oxygen, there will be no
(7)______ that will occur.
An example of change in the material when oxygen is present is rusting.
(8) _______ is formed when iron and oxygen react with water or air moisture.
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Answer:
1.Oxygen
2.fire
3. water
4. oxygen
5. carbon dioxide
6. fuel
7. physical changes
8. rusting
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