What term includes land and all human-made improvements?

The term that encompasses land as well as all human-made improvements is "real estate." This concept includes not just the physical land itself but also all buildings, structures, and fixtures that are attached to it. Real estate represents the entirety of the property in a legal and economic context.

"Real property," although closely related, is often used in a legal sense to refer to the ownership rights associated with the land and improvements, rather than the physical components themselves.

"Land" specifically refers to the Earth's surface and may also include the minerals and resources beneath it, but does not account for any improvements or structures.

"Fixtures" are items that were once personal property but have been permanently attached to the land or buildings, therefore becoming part of the real estate, but this term does not cover the entire scope of what is included in real estate.

In summary, "real estate" is the most accurate term that encapsulates both land and human-made improvements.