no one noes
Yes they do.
Precipitation and crystallisation of calcium carbonate dissolved from the limestone by water leaching through the joints, bedding-planes or faults in the rock.
In caves formed in limestone - as are most of the world's caves although not all such caves contain stalagmites and stalactites. They are precipitations of calcite dissolved from the host limestone by carbonic acid - rain water acidified by atmospheric carbon dioxide dissolved in it.
Stalac"tites", top, or on the roof of the cave. Stalagmites form on the floor of caves.
They typically form in caves where they can grow undisturbed for hundreds of years. Stalagmites grow from the floor up and stalactites stick to the ceiling. Dripping water deposits minute amounts of limestone that build up over the years. +++ You do sometimes find small, rather coarse versions growing under bridges etc.built from bricks or ashlar masonry and mortar. Here, the calcite that is their constituent mineral has been leached from the structure's mortar. However caves in limestone (the rock hosting by far the majority of caves) are the natural home for stalagmites and stalactites, and their related formations.
More often stalactites than stalagmites, but they can sometimes be found under arches such as railway bridges built of limestone masonry and/or lime mortar, and exposed to the weather.
Limestone - they are of calcite, the crystalline form of the rock's primary constituent, calcium carbonate.
Which ones? Oh, and "stalactites". They form in caves developed in limestone.
Precipitated as stalactites, stalagmites etc - and it is the primary constituent of the limestone in which the vast majority of caves form!
In caves formed in limestone - as are most of the world's caves although not all such caves contain stalagmites and stalactites. They are precipitations of calcite dissolved from the host limestone by carbonic acid - rain water acidified by atmospheric carbon dioxide dissolved in it.
Stalactites and stalagmites are found in limestone caves. Stalactites hang from the ceiling, and stalagmites come up from the ground.
In areas where the rocks are made of limestone, water will dissolve the limestone and form underground caves. In these caves water containing dissolved limestone will drip from the roof. As the drips form some of the water evaporates and limestone is deposited out of solution. Thus, from where the drips are occurring and on the floor below, pilers start to form, the pilers on the floor are called 'stalagmites' and the pilers hanging from the roof are called 'stalactites'.
Stalactites and stalagmites are found in limestone caves. Stalactites hang from the ceiling, and stalagmites come up from the ground.
Stalac"tites", top, or on the roof of the cave. Stalagmites form on the floor of caves.
STALAGMITES
They usually grow from limestone. Mostly in caves.
Water, erosion, and time. Limestone is a common rock that these geologic structures form in because of it's relative softness.
Stalacties are secondary minerals that commonly form on the ceiling of limestone caves. Stalagmites are formations that rise out of the ground of caves - formed by calcium salt deposits left from water drips. Therefore the difference lies within where they are formed within the cave.
CAVES! These are the dripstones (like stone icicles) that hang from the ceiling (stalactites) or the ones growing upward from the floor (stalagmites). The easiest way to remember which is which--imagine that the stalactites are hanging on tightly to the ceiling.