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Geologist Iain Stewart retraces the steps of a band of maverick pioneers who made ground-breaking discoveries in the landscape of Scotland about how our planet works.
2012
0.0
2004
6.0
2006
1974
6.8
2020
5.0
2007
2009
8.0
2005
2018
7.0
1988
7.5
1964
7.4
2003
2.0
2013
7.1
2016
2008
5.4
2010
6.2