Concept:In economics, land means all free gifts of nature, including exhaustible resources.
Explanation:Natural gas is a naturally occurring resource found on or beneath land.
It is non-renewable because once it is extracted and consumed, it cannot be replaced or regenerated within a relevant time scale.
The other options are not correct examples of non-renewable land.
Marshy and water-logged land is renewable in nature, while oxygen and carbon dioxide are atmospheric gases, not land resources.
Farmlands used for many years can still be replenished if properly managed.
Answer:B. some natural resources such as natural gas