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Grottor. Grottor kan bildas på olika sätt. De största bildas i kalksten då vatten med lågt pH löser upp kalken. Olika former av droppstenar bildas i dessa grottor. Blockgrottor bildas exempelvis då en bergsbrant rasar och blocken lägger sig så att en grotta bildas.
Stalaktiter i Lummelundagrottan på Gotland.
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