Answer:
D. Using high-pressure fluids to fracture gas-rich shale deposits far underground.
Step-by-step explanation:
The process of fracking involves
using high-pressure fluids to fracture gas-rich shale deposits far underground so as to force open existing fissures and extract oil or gas. Water, sand and chemicals are injected into the rock at high pressure which allows the gas to flow out to the head of the well.