Earth’s continents became long-lasting when parts of the deep crust briefly heated above about 900°C (roughly 1,650°F). A new study argues that this intense heat allowed the crust to shed its internal heat producers, then cool and toughen for the long haul. The work centers on the lower crust, about 20 to 25 miles down beneath stable continental interiors. It links a simple driver – heat – to a big outcome, continents that survive for billions of years.
More, here.
