Ancient Giant Geodes Deep Beneath Sicily | Earth: The Power of the Planet | BBC Earth Science
Half a kilometre beneath the island of Sicily tonnes of salt and rock crystals can be found, formed when the Mediterranean Sea dried up millions of years ago. The combination of hot volcanic water and seawater created a rich, mineral mixing zone where these crystals have grown up to a metre long.
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Earth: The Power of the Planet (2007)
Examining the great forces that shape the Earth - volcanoes, the ocean, the atmosphere and ice - the programme explores their central roles in our planet's story. How do these forces affect the Earth's landscape, its climate, and its history? CGI gives the audience a ringside seat at these great events, while the final episode brings together all the themes of the series and argues that Earth is an exceptionally rare kind of planet - giving us a special responsibility to look after our unique world.
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