This type of deposit is called a stalactite. Stalactites are made up of calcium deposits from the runoff water coming into the cave.
A stalactite. Strcitly speaking it's of calcite rather than limestone but the mineral is the primary constituent of limestone.
stalactite
Stalactite.
stalactite
They are formed by the deposit of minerals. They are left behind by evaporation.
A sinkhole
I would call it a cave in.
A stalactite.
Cone shaped deposits that rise from the floor of a cave are called Stalagmites. This is easy to remember as it contains a letter 'G' as does ground. While a Stalactite, which hangs down from a cave ceiling, contains a letter 'C.'
stalagtite
stalagtite
stalactite
A deposit on the roof of a cave is typically referred to as a stalactite, which is a mineral formation hanging from the ceiling that is formed by the dripping of mineral-rich water. Stalactites are a common feature in caves and can vary in size and shape depending on the minerals present in the water dripping from the cave ceiling.
This is called a "Stalactite"
Stalactites
They are formed by the deposit of minerals. They are left behind by evaporation.
Stalactites form at the roof of the cave. These are mineral deposits that hang from the ceiling and are typically made of calcium carbonate. They form as water containing dissolved minerals drips from the roof and the minerals gradually accumulate over time, creating the elongated formations known as stalactites.
Stalactites are found hanging from the roof of a cave, as opposed to stalagmites, which grow up from the floor. Remembering the difference is easy - stalactites are "tite" to the ceiling!
A sinkhole
A sinkhole forms.
That's called a stalagmite. A similar object descending from the roof of a cave = is a stalactite.