Crossword
Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
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Check
Across:
1.
Compounds of carbon and hydrogen
3.
Contains 98% carbon
5.
Rock oil
7.
amount of heat produced by complete combustion of a fuel
8.
Different from natural gas
10.
fuel of vehicles
Down:
2.
Gas containing primarile methane
4.
a fossil fuel
6.
lowest grade of coal
9.
enery obtained from sun
OK