There are mysterious things lurking at the bottom of the ocean, from underwater volcanoes to mysterious graphite. Where did a pumice raft floating across the Pacific come from? Why is a raft of pumice larger than Manhattan heading to Australia? What can we learn by studying petit-spot volcanoes underneath the ocean? What connects young volcanoes with the motion of the tectonic plates? What roll do hydrothermal vents play in the carbon cycle? Where does all this graphite in the oceans come from?

1. Philipp A. Brandl, Florian Schmid, Nico Augustin, Ingo Grevemeyer, Richard J. Arculus, Colin W. Devey, Sven Petersen, Margaret Stewart, Heidrun Kopp, Mark D. Hannington. The 6–8 Aug 2019 eruption of ‘Volcano F’ in the Tofua Arc, Tonga. Journal of Volcanology and Geothermal Research, 2019; 106695 DOI: 10.1016/j.jvolgeores.2019.106695