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📘 How do stalactites grow

Stand beneath a cave ceiling and look for the places where darkness gathers into points. A stalactite begins when water reaches an air-filled passage. Rain has already traveled through soil and cracks in rock, so it is not chemically empty.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The water arrives carrying rockTrace how rainwater acquires dissolved limestone and reaches a cave ceiling.Soil carbon dioxide and fractures turn ordinary rainwater into a mineral-delivery system.
  2. The drop loses carbon dioxideExplain why calcite precipitates when mineral-rich water enters cave air.Degassing changes water chemistry and leaves the first rings of a soda-straw stalactite.
  3. Shape depends on flowConnect stalactite shape and growth rate to drip paths and local cave conditions.Blocked tubes thicken, while water supply, chemistry, ventilation, and evaporation set the pace.
  4. The cave records changing conditionsRelate stalactites to stalagmites, columns, and the environmental history preserved in cave deposits.A drip system can build formations above and below while recording pauses and changes in underground climate.

Questions this course answers

What makes rainwater able to dissolve limestone before it reaches a cave?

Carbon dioxide dissolves into soil water and forms weak carbonic acid, which helps the water carry dissolved limestone.

Why does calcite begin to deposit when mineral-rich water enters an air-filled cave?

Degassing changes the water chemistry, allowing calcite to precipitate on the ceiling or around a drip.

What is the usual early form of a stalactite?

Repeated rings of calcite first build a narrow hollow tube; if it becomes blocked, water can flow over the outside and thicken it.

Why can two stalactites in the same cave grow at different rates?

Growth is local and changes with drip rate, dissolved calcite, rainfall, cave air, and other conditions.

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