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How is gas extracted from shale?

How much do you know about gas extraction?
How much do you know about gas extraction?
iStockphoto/Thinkstock

Beneath the surface of a large portion of North America, buried in ancient bedrock, is a massive reserve of natural gas. This gas, however, is locked in shale and cannot simply be drilled out. Instead, a process known as "hydraulic fracturing" must be used.

On the next page, learn about "fracking" and discover why people are concerned.

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