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CRITICAL THINKING ACTIVITY: THE METHANE CYCLE

Student Sheet 1 CRITICAL THINKING ACTIVITY: THE METHANE CYCLE WHAT IS METHANE ? METHANE is a chemical compound with the molecular formula CH4. It is the main component in natural gas. METHANE is considered the simplest of alkanes, compounds that consist only of hydrogen (H) and carbon (C) elements. METHANE is an odorless, colorless, tasteless gas that is lighter than air. When METHANE burns in the air it has a blue flame. In sufficient amounts of oxygen, METHANE burns to give off carbon dioxide (CO2) and water (H2O). When it undergoes combustion it produces a great amount of heat, which makes it very useful as a fuel source. METHANE AS A GREENHOUSE GAS METHANE is a very effective greenhouse gas. While its atmospheric concentration is much less than that of carbon dioxide, METHANE is 28 times more effective (averaged over 100 years) at trapping infrared radiation.

including methane, cycle this way too. There are many sources that release methane (CH 4) into the atmosphere. There are also sinks or ways that methane is trapped or destroyed. The methane cycle begins in the soil where methane gas is created by microbes. Soil methane is consumed by methanotrophs, microorganisms that feed on methane.

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