Here's why:

* Geological Formation: Missouri is situated in the Ozark Plateau, which is primarily composed of sedimentary rocks, particularly limestone.

* Karst Topography: The presence of limestone has led to the formation of Missouri's distinctive karst topography, characterized by caves, sinkholes, and springs.

* Economic Significance: Limestone is a vital resource in Missouri, used in construction, agriculture, and other industries.

While limestone is the most prevalent rock type, other notable rocks found in Missouri include:

* Dolomite: Often found alongside limestone, dolomite is another sedimentary rock.

* Sandstone: Found in some areas, sandstone is formed from cemented sand grains.

* Chert: A hard, brittle rock often associated with limestone formations.

So, while Missouri has a variety of rock types, limestone reigns supreme in terms of abundance.