Donald Trump has been defiant on tariffs. Now China has upped the ante. It has halted the exports of rare earths, used in everything from iPhones to jet engines. It has also paused incoming deliveries ...

One of two main craters on Alaska’s Mount Spurr, shown in 1991. Earthquake activity suggests the volcano is close to erupting again in 2025. R.G. McGimsey/Alaska Volcano Observatory/U.S. Geological ...