Hydraulic fracturing

8. Fine-grained sedimentary rocks that can contain oil and natural gas.
9. Natural gas found in fine-grained sedimentary rocks.
10. Tiny solid materials used to keep fractures open in rocks.
11. A mixture of water, sand, and chemicals used in fracking.
12. Water returning to the surface after fracking, often containing contaminants.

1. Techniques like fracking used to extract oil and gas from difficult reservoirs.
2. A potent greenhouse gas released during natural gas production.
3. A hole drilled into the earth to access oil or gas.
4. The depth where the drilling angle changes to reach the target formation.
5. Energy sources formed from ancient organic matter, such as coal or gas.
6. Cracks or fractures created in rock formations during fracking.
7. Gases that trap heat in the atmosphere, contributing to climate change.
12. The process of injecting high-pressure liquid into rocks to extract oil or gas.