Across 1 Oil, coal and natural gas are examples of these (6,5) 5 Oil and gas can

Question

Across 1 Oil, coal and natural gas are examples of these (6,5) 5 Oil and gas can rise through this sort of rock (6 6 Fuels react with this gas when they burn (6) 9 Small molecules which can join together to make polymers (8) 10 Hydrocarbons which have a double bond between carbon atoms (7) 11 Hydrocarbons which have only single bonds between carbon atoms (7) 13 Atmospherie layer that filters out harmful UV light (5) 14 Another name for burning (10) 15 A liquid that flows easily is not very.7) Down 2 Like being soaked through-alkanes are this (9) 3 Small hydrocarbons have this sort of boiling point (3) 4 Compounds of carbon and hydrogen, found in oil (12) 7 Poly(ethene) is made from these molecules (6) 8 Global warming is caused by this sort of gas (10) 12 Element found in many fuels that can cause strong acid rain (7)

Explanation / Answer

1) fossil fuels

5) quartz

6) oxygen

9) monomers

10) alkenes

11) alkanes

13) ozone

14) combustion

15) viscous

2)

3) low

4) hydrocarbons

7) ethene

8) greenhouse

12) suphur

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