Combustion cross word
Across
- 1. a poisonous gas which we can not see
- 5. what things are required to make something
- 6. everywhere around the earth and has many gases
- 7. an item required for combustion
- 9. something water is mostly made of
Down
- 1. the process of fire burning
- 2. something the atmosphere is mostly made from
- 3. if something can catch on fire or not
- 4. an element that requires oxygen to work
- 5. an item that powers lots of items
- 8. a waste substance created from the use of fuel