News
"Fracking", a Way to Extract Natural Gas, Stirs Debate
9
Protestors at a Philadelphia, Pennsylvania call for drilling to stop in the Marcellus Shale, the largest reservoir of natural gas in the United States. (Photo: Jacques Jean Tiziou)
10
Drill bit used to dig more than a kilometer through layers of rock to reach shale deposit underground. (Rosanne Skirble/VOA)
11
Nearly one-thousand tanker water trucks are needed to service a single hydraulically fracked natural gas well. (Photo: Marcellus Shale U.S.)
12
Twenty to forty percent of the fracturing fluid flows back out of the well and is contained in large waste pools excavated near the gas site. (Photo: Marcellus Shale U.S.)