Fracking opens cracks that exist in underground rock, allowing gas to escape back up through the well. Which statement best describes an environmental consequence of this process? A Wastewater is contaminated with oil and becomes sludge in landfills.
B During natural gas extraction, methane escapes into the atmosphere.
C Water vapor is released into the air, which is considered a greenhouse gas.
D Heavy metals are released into surrounding soil, poisoning local vegetation.