In June 1991, the second-largest volcanic eruption of the 20th century occurred in Luzon, Philippines, 90 km (55 mi) northwest of Manila. Mount Pinatubo's 1991 eruption killed 800 and displaced 100,000. Millions of tonnes of sulphur dioxide released on June 15 lowered global temperatures for years. *** Mount Pinatubo lies on the western coast of Luzon, where composite volcanoes run across the island...