The volcano on La Palma, in Spain’s Canary Islands, continues to spew volcanic ash and send lava flowing a week after it started erupting. More than 500 buildings have been buried by lava, and more than 6,000 people have been displaced. The World’s Marco Werman speaks to Loÿc Vanderkluysen, a volcanologist at Drexel University, about the hot spot in the Earth’s mantle causing the eruption.