MADRID--Residents on the Spanish island of La Palma dared to hope Wednesday that a volcanic eruption is over after almost three months of unnerving daily explosions, earthquakes, rivers of molten rock and a huge ash plume containing toxic gases. The Cumbre Vieja volcano in the Canary Islands off northwest Africa fell silent on Monday evening, and scientists said its 36 hours or so of negligible activity might signal the beginning of the end of the eruption. Scientists won’t rule out a resurgence