AP®︎ Environmental Science: Topic 6.7 Flashcards

Master key terms and definitions for Topic 6.7 of AP Environmental Science – Energy from Biomass to help you prep for quizzes and the AP exam.

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Term

Biomass

Definition

Recently living organic material used as fuel; it stores chemical energy originally captured from sunlight through photosynthesis

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Biomass
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Recently living organic material used as fuel; it stores chemical energy originally captured from sunlight through photosynthesis

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Biogas
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Methane-rich fuel produced by anaerobic decomposition of organic matter and burned for heat or electricity

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Sustainable Biomass Harvesting
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Harvesting biomass no faster than it regrows and in ways that avoid resource depletion and unacceptable environmental damage

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Carbon Neutrality of Biomass
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The conditional balancing of combustion CO₂ by CO₂ absorbed during regrowth; land-use change and fossil-energy inputs can prevent full life-cycle neutrality

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Ethanol
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An alcohol biofuel made by fermenting plant sugars and used as a substitute for or additive to gasoline

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Energy Return on Energy Investment (EROI)
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Usable energy obtained ÷ energy required to produce the fuel; ethanol has a low EROI and therefore a relatively small net energy gain

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