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Which sentence describes energy flow through a natural (not manufactured) system?


A strong wind blows across a Midwestern prairie. The wind forces the blades of a wind turbine to rotate. As the blades spin, the turbine converts mechanical energy to electrical energy. The electricity generated by the wind turbine is used to power nearby homes.

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Erudite1
The correct option is: A STRONG WIND BLOW ACROSS A MIDWESTERN PRAIRIE.
This sentence describes energy flow between two natural elements. The strong wind is natural and the prairie is natural.
 But the other sentences involved artificial systems which had been set up by man. A turbine is a machine that is used to generate energy from wind; it is an artificial system created by man.

Answer:

A STRONG WIND BLOW ACROSS A MIDWESTERN PRAIRIE.

Explanation:

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