Synopsis
The walls of these caves are covered in fragile crystals made of gypsum, which is created when limestone is dissolved by sulphuric acid.
- Programme: Planet Earth
- Episode: 04: Caves
- Channel: BBC One
- Broadcast year: 2006
- Geography
Licence: ERA Licence required
Free to watch for UK schools, colleges and universities with an ERA Licence
UK only
Staff and students of licensed education establishments only
Cannot be adapted
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