A group of people swims in a river. A construction crew builds an iron bridge. A farmer grows vegetables to sell at a local market. A person bakes a cake with electricity produced by a hydroelectric power plant.
I gave my students this multiple choice question: All natural resources on Earth are either renewable or nonrenewable. Whether a resource is renewable or nonrenewable depends on how fast or slow the resource is replaced. If the resource is used faster than it is replaced, then the resource will, in time, disappear. Which activity shows the use of a nonrenewable natural resource?

Only one answer is correct among these 4 choices:
- A group of people swims in a river.
- A construction crew builds an iron bridge.
- A farmer grows vegetables to sell at a local market.
- A person bakes a cake with electricity produced by a hydroelectric power plant.

Could you tell me which one is correct?

A construction crew builds an iron bridge.