Question

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.

Answer 1

The correct answer is 'a strong wind blows across a Midwestern prairie’. This is an example of two natural resources with energy flowing between them. The wind turbines and resulting electrical power are manufactured.

Answer 2

The correct option is this: A STRONG WIND BLOW ACROSS A MIDWESTERN PRAIRIE.

A strong wind is an example of a natural force. The prairie refers to a land fill with grasses and that is a natural factor also. Thus, a strong wind that is blowing across a prairie is generating a natural form of energy. The energy flow in the other options given are examples of man made devices.