Question

workers protect people from dangerous landfill methane by
a using water to wash the gases away.
b removing the waste and storing it in other places.
c covering their homes with special plastic.
d using materials to trap the gases under the soil.

Explanation:

To solve this, we analyze each option:

• Option A: Water is not effective in washing away methane gas from landfills. Methane is not easily dissolved or removed by water in this context.
• Option B: Removing waste and storing it elsewhere doesn't address the methane already produced in the landfill or prevent its release. It's not a practical method for methane control.
• Option C: Covering homes with special plastic is not a method used by workers to protect people from landfill methane. Landfill methane is a site - specific issue, and protecting homes this way is not a standard or effective approach.
• Option D: In landfills, workers use materials (like clay or other impermeable liners) to trap the methane gas under the soil. This prevents the gas from escaping into the atmosphere and posing a danger to people.

Answer:

D. using materials to trap the gases under the soil.