★ 6.9
★ 4.0
★ 7.9
★ 0.0
★ 7.5
★ 6.8
★ 8.5
★ 7.0
★ 5.8
★ 8.0
★ 3.7
★ 6.0
★ 6.7
Dr Iain Stewart tells the story of how Earth works and how, over the course of 4.6 billion years, it came to be the remarkable place it is today.
