Answer :
Final answer:
The common extraction methods for natural gas include horizontal drilling and fracking and drilling vertical wells. These techniques allow for efficient extraction of gas from underground reservoirs. Other options listed are not suitable for natural gas extraction.
Explanation:
Extraction Methods for Natural Gas
Natural gas is often extracted from the earth using several specialized methods. Among the options provided, the two common extraction methods are:
- Horizontal drilling and fracking: This technique involves drilling horizontally into gas-bearing rock formations and then using hydraulic fracturing, or fracking, to create fractures in the rock. This allows trapped gas to flow more freely to the well, making it easier to extract. This method has significantly increased the production of natural gas in recent years.
- Drilling vertical wells: This is the traditional method of drilling straight down into the earth to reach natural gas reservoirs. Although this method is less efficient compared to horizontal drilling, it is still widely used, particularly in older gas fields.
The other methods mentioned, such as in-situ leaching and subsurface mining, are not applicable for natural gas extraction; they are typically used for minerals or metals. Understanding these methods is crucial for appreciating modern energy production techniques.
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