The tuya is a structure formed by a subglacial (under ice) volcano. Lava erupts underneath an overlying glacier or ice sheet. It melts through to the surface and pools, producing the flat plateau on top with near-vertical walls along the ice-contact margin as the lava cools and hardens.
A similar landform is the tepui, which has a rather different origin. A body of hard rock resists erosion. It was originally inside a body of softer rock such as limestone, which got eroded away to form a plain. The more resistant rock is left behind as an isolated mountain. The term is used for the table-top mountains of South America. Auyán-tepui in the Guiana Highlands, Venezuela is the source of the Angel Falls, the tallest waterfall in the world. It is 19 times higher than Niagara Falls.
- Table hill
- Table-topped hill
- Table mountain
References[change | change source]
- Brewer-Carías C. 2010. Tras la huella: del Salto Angel. Río Verde 2: 61–77.