sedimentary rocks usually (limestone is the most common). they are very easily eroded away leaving a cavern or series of caves tunneling for miles interconnecting. This is very common in Missouri whom has thousands of caves due to its vast supply of limestone
These small crystal-lined spheres are called geodes. They form when minerals crystallize inside a cavity within the limestone rock.
No, a thin cavity in a rock showing where a shell has decayed is not considered a fossil. Fossils are the preserved remains or traces of ancient organisms, such as bones, shells, or imprints, that have been naturally preserved in rock or sediment over time. The empty space left behind by a decayed shell would be considered a mold or cast, not a fossil.
A hollow space in a rock is called a vug or a vuggy. It is typically formed when minerals dissolve or are weathered away, leaving a cavity within the rock. Sometimes, vugs can be lined with crystals or other minerals.
A sinkhole is a depression or hole in the ground caused by the collapse of a surface layer into an underground cavity. A natural bridge is a rock formation that has been formed by erosion to create an arch-like structure spanning a gap. Sinkholes are typically formed by chemical weathering and collapsing ground, while natural bridges are created by the erosion of rock formations.
There are man made imitations but real granite is a natural rock.
Rock caverns are not built they are eroded out of solid rock by natural processes.
Vug
Vug
A subterranean cavern is an underground chamber or cavity formed by natural processes such as erosion, dissolution, or volcanic activity. These caverns can be large or small, with unique features such as stalactites, stalagmites, and underground lakes.
Caverns and sinkholes typically form in areas with soluble rock such as limestone, where water dissolves the rock over time. Caverns are created by the slow dissolution of underground rock, while sinkholes form when the roof of a cavern collapses or the ground above a cavity caves in. Both processes are part of the natural geological phenomenon of karst topography.
It is called a mold.
It is called a mold.
it is limestone
a cave is like an arch formed by the erosion of the sea. +++ It may be, but a cave properly is any natural, subterranean cavity of humanly-enterable size, and in scale anything from a small sea-cave (as above) to vast systems of passages and chambers like Mammoth Caves.
A cavern roof is the uppermost part of a cave that forms the ceiling of the underground chamber. It is typically formed by the natural processes of erosion, weathering, and water seepage over time. Cavern roofs can vary in appearance and structure depending on the type of rock or material they are composed of.
temple. Another word for dungeon is oubliette which is French for "the forgotten place". Prisoners were held in oubliettes to be "forgotten".
Fraggle Rock - 1983 The Cavern of Lost Dreams 3-19 is rated/received certificates of: Australia:G