Earth science

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Warm water cuts inverted 'ice canyon'
An Antarctic ice shelf is shown to have a deep gorge cut in its underside by warm ocean water.
'High probability it's the Athenia'
Shipwreck-hunter David Mearns believes he has identified the passenger liner Athenia on the seafloor.
Dan McKenzie recalls science revolution
The Cambridge professor remembers his role in helping to formulate the theory of plate tectonics.