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🔻Stalactite vs Stalagmite🔺

Caves grow remarkable mineral formations over thousands of years. Stalactites and stalagmites form from the same dripping water, just at different ends.

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🔻Stalactite
  • Hangs downward from a cave ceiling
  • Forms as mineral-rich water drips and leaves deposits
  • Grows slowly, often a fraction of a millimeter a year
  • Usually tapered, like an icicle of rock
  • The hollow soda-straw type is its earliest stage
🔺Stalagmite
  • Rises upward from a cave floor
  • Forms where dripping water lands and deposits minerals
  • Grows slowly, building up over millennia
  • Usually thicker and more rounded at the top
  • Often sits directly below a matching stalactite

Verdict

Stalactites hang from the ceiling while stalagmites build up from the floor. Given enough time the two can meet and merge into a single column of rock.

Frequently asked

How can I remember which is which?+

Stalactite has a 'c' for ceiling; stalagmite has a 'g' for ground.

How fast do they grow?+

Very slowly, often less than a millimeter per year, so large formations are thousands of years old.

What happens if they meet?+

A stalactite and stalagmite can join into a continuous column of mineral rock.

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