Easily eroded by water, limestone's composition means it makes up spectacular sights all over the world. Learn about some of the surface and underground features of this rock type.
- Limestone is a sedimentary rock formed underwater over millions of years.
- Limestone is permeable, soluble and reactive with acid, and is worn away over time by rainwater to form distinctive features.
- The erosion of limestone at the Earth's surface creates karst landscapes, sinkholes, narrow valleys and steep-sided gorges.
- Limestone caves are formed below the surface, and rainwater drains through the rock to form stalactites (drips from the ceiling) and stalagmites (from the landing drips).
Limestone makes up around 10% of Earth's surface.
Nullarbor Plain, Australia
It forms diverse landscapes and features from vast, arid plateaus.
To sharp mountain pinnacles.
Limestone is sedimentary rock formed underwater over millions of years.
Formed underwater over millions of years
At least 80 % calcium carbonate
But even above sea level, water's influence on this ...
Please log in to view and download the complete transcript.