20. Any non-natural structure built on or affixed to land is an:

Answer: A

Explanation:

Non-natural structures built on or affixed to land are classified as improvements.

Improvements refer to any non-natural structures that are constructed on or attached to land, enhancing its value or utility. This includes buildings, roads, and other man-made enhancements.

A) improvement

This option is correct as it accurately defines non-natural structures built on land. Improvements increase the functionality and value of the property, distinguishing them from natural features.

B) encumbrance

Encumbrance refers to a claim or liability attached to a property, which may restrict the owner's ability to use it fully. This concept does not apply to structures themselves but rather to legal claims against the property.

C) appurtenance

An appurtenance is a right or privilege associated with a property, often transferring with the sale of the property. While it pertains to ownership, it does not specifically describe the physical structures built on land.

D) emblement

Emblements are crops or plants that are cultivated and can be harvested, which are considered personal property. This term is irrelevant to the classification of structures built on land and therefore incorrect.

Conclusion

The term "improvement" precisely defines non-natural structures built on land, signifying enhancements that increase property value. The other options, while relevant in property law, do not accurately describe the physical structures in question, confirming that "improvement" is the definitive answer.