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Series showing how new camera technology is revealing the inner workings of the Earth's most spectacular natural wonders.
2014
3.0
1988
6.9
2015
6.0
2008
7.3
7.0
2013
5.5
0.0
8.1
2009
8.0
2010
6.6
8.2
1964
7.4
1999
1998
2016
10.0
2002
2011
2001
8.9