Forming stalagmites and stalactites, for 10 points, name this white, easily erodible rock, notable for forming sinkholes and underground caves.
The Chinese landforms of the Miao Room and Shilin are both composed of this type of rock. One theory supposes that the Mayans found the zenith days of the sun using the Holtun cenote, which is made of this rock, and the Great Pyramid of Giza was built primarily using this material. The Lower Florida Keys are composed of this type of rock, formed by the fossilization of an ancient (*) reef. This rock, when eroded, forms karst topography, which can be found at Mammoth Cave. Forming stalagmites and stalactites, for 10 points, name this white, easily erodible rock, notable for forming sinkholes and underground caves.
The Chinese landforms of the Miao Room and Shilin are both composed of this type of rock.
limestone [prompt on calcium carbonate or CaCO3] &lt;DM&gt;