PhysicsHot rubble from volcanoes races over land on a carpet of air bubbles Clouds of rocks and gas known as pyroclastic flows spew out of volcanoes and race over land at terrifying speeds, skating on an air pocket beneath the rubble 51¶¯Âþ
EarthDark matter secrets could lie buried in ancient rocks on EarthFossil traces hidden deep underground may solve the mystery of dark matter, the elusive substance that makes up 80 per cent of the universeFeatures