Here's why:

* Monolith: A single, massive rock formation that stands out from its surroundings. Uluru fits this description perfectly, towering above the flat, desert landscape.

* Inselberg: Uluru is also sometimes classified as an inselberg, which is a German word meaning "island mountain." This refers to a prominent, isolated rock formation rising from a plain.

So, while "monolith" is the most common term, "inselberg" is also accurate.