Across
- 2. Gas is a non-_______________ source of energy.
- 4. The type of resource gas is.
- 5. The controversial process of extracting gas that involves injecting bedrock with water and chemicals.
- 6. Used to transport gas.
Down
- 1. The country with the highest gas reserves.
- 2. The process of removing unwanted chemical impurities from gas.
- 3. Gas forms from decomposing plant and ________ animal matter, combined with heat and pressure below the surface of the Earth.
- 7. The energy the plants originally obtained from the _________ is stored in the gas.