DU3- Underground heritage and European tourist caves.

9 from J to O terms

Karst valleys
Fluvial karst on karst rock mass, with vertical walls, that come in handy as fluvial valley like canyons and sickles or remaining out of current stream, calling in that way dry or die valleys.
https://pixabay.com/
karstification
Usually refers to the process where carbonate outcrops to the earth's surface due to tectonic movement and thereby is exposed to leeching and dissolution by atmospheric water.
Source: © M. Bakalowicz
karts
Is a type of landscape where the dissolving of the bedrock has created sinkholes, sinking streams, caves, springs, and other characteristic features. Karst is associated with soluble rock types such as limestone, marble, and gypsum.
Lava Tubes
A lava tube, or pyroduct is a natural conduit formed by flowing lava from a volcanic vent that moves beneath the hardened surface of a lava flow. If lava in the tube empties, it will leave a cave. This type of lava cave is formed when a low-viscosity lava flow develops a continuous and hard crust, which thickens and forms a roof above the still-flowing lava stream
Frank Schulenburg, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
Limestone pavements or karrens
They mean “field of stones” and they are minor forms of karst. They occur on naked surfaces or soil with vegetation, because runoff action originates blocks separate by channels or passages as a result soluble rock dissolution. First ones are produced by tectonic movements together with weathering as second ones are only the result of rock erosion. It usually takes place in high zones where limestone occurs
By Northernhenge - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=80213676
Micrite
Sedimentary rock formed of calcareous particles ranging in diameter from 0.06 to 2 mm (0.002 to 0.08 inch) that have been deposited mechanically rather than from solution.
Rygel, M.C., CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
Mogotes
When most of rock has been dissolved because karst processes, sharp, conical and pyramid reliefs remain.
James Parker, https://www.treknature.com/
Oncolihts
Due to algae activity, nucleus surrounding layers are not regular.
Wilson44691, Public domain, via Wikimedia Commons
Oolites
Spheric sand grains formed by regular carbonate layers surrounding a nucleus. They originate in shallow seas where waves are constant
Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster)., Public domain, via Wikimedia Commons