Question

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what type of gas is produced in a landfill from decomposition and can be collected and used as a fuel to generate electricity?
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Explanation:

In landfills, organic matter decomposes (anaerobically in many cases). The main gas produced from this decomposition is methane ($\ce{CH_4}$), which is a combustible gas and can be used as a fuel to generate electricity. This is related to environmental sciences (a subfield of Natural Science) as it involves waste management and energy production from waste.

Answer:

Methane (or $\ce{CH_4}$)