WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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A life-cycle assessment compares natural cotton grocery bags with synthetic polyethylene plastic bags. Cotton bags require large land areas and high water usage to grow, but biodegrade in months. Polyethylene bags require low water during production, but persist in oceans for centuries. What is a key scientific conclusion from this data?

Synthetic materials have zero negative environmental impacts across their life cycle Natural materials are always superior to synthetic materials in every stage of resource extraction and disposal Evaluating material sustainability requires analyzing both production resource costs and disposal environmental persistence Plastics biodegrade faster when submerged in ocean saltwater

Correct Answer:

Evaluating material sustainability requires analyzing both production resource costs and disposal environmental persistence

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