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4. Pipes and valves installed at a wellhead to regulate natural gas flow are called a christmas tree.

6. The source rock for natural gas is sedimentary rock.

10. Several types of vehicles run on natural gas.

13. Fossil fuels were formed from plants and animals thousands of years ago.

14. Mercapten is the odourant added to natural gas, that makes it smell like rotten eggs.

16. Natural gas is less harmful to the ozone layer than many other conventional fuels.

17. Natural gas is the cleanest burning fossil fuel.

18. Turning down your thermostat every night can conserve energy.

19. Natural gas is the lightest fossil fuel and has the lowest emissions of any fossil fuel.

Down

1. Most of Canada's natural gas is located in the prairie provinces.

2. An anticlinal trap is formed of an upward arching of the rock strata.

3. Natural gas is a fossil fuel composed mostly of methane.

4. Natural gas is stored in manufactured storage facilities called caverns.

5. Natural gas deposits are often found several thousand feet under ground.

7. Insulation can keep your house warm, just like a sweater keeps you warm.

8. Gas that has just come from the well is referred to as raw gas.

9. Natural gas is a nonrenewable resource.

11. An energy efficient furnace uses less gas and saves money.

12. A sample rock taken from an underground formation is a core sample.

15. Closing blinds and curtains on windows can help conserve energy.