EarthGiant boulder on clifftop in Tonga was carried by a 50-metre-high wave A huge tsunami hit a cliff in Tonga 7000 years ago and carried a 1200-tonne boulder 200 metres inland, making it the biggest wave-lifted boulder ever found on a cliff News
EnvironmentAre vast amounts of hydrogen fuel hidden below Earth's surface? Geologists estimate Earth contains several trillion tonnes of natural hydrogen that could be used as a clean fuel, but a global search for large reserves hasn’t delivered so far News