The pointy things inside a cave are called stalactites.
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Inside a cave, you would typically hear echoes of your own movements and sounds, as well as any water dripping or flowing. The smell inside a cave might be musty, damp, and earthy due to the lack of ventilation and presence of minerals and soil.
Stalactites hang down from the cave ceiling and typically have a tapering, icicle-like shape. Stalagmites rise up from the cave floor in a cone-like or columnar shape. Both formations are created by mineral-rich water dripping from the cave ceiling and depositing minerals as the water evaporates.
Its called a Stalactite---The icicle-like things that hang from the ceiling of a cave are called "stalactites" whilst the ones that are directly under them and go up from the ground are called "stalagmites". The easy way to remember the difference is that "stalactites" hang TIGHT (tite) to the ceiling and "stalagmites" are MIGHTy sturdy on the ground. I realize it sounds corny but it makes you remember.- Lightning_Po
Stalactites hang tightly to the ceiling of a cave, while stalagmites might grow to reach the cave floor. The names reflect their formation as water drips from the ceiling to form stalactites, and drips onto the cave floor to form stalagmites.
The highest stalagmite currently known is in the Grotte de Clamouse cave in France and it is called the Giant. It stands at around 30 meters tall.