The Hayli Gubbi volcano in Ethiopia, located about 500 miles from the capital city of Addis Ababa, erupted on Sunday for the first time in about 12,000 years. The eruption was not too devastating as such events go, but it did release an enormous plume of ash, which rode the subtropical jet stream and quickly expanded to cover parts of Yemen, Oman, India, and Pakistan. Air India announced it canceled at least 11 flights on Tuesday due to concerns over the cloud. “The affected altitude is between 8.5 kilometers (5.2 miles) and 15 kilometers above the sea level,” said Mrutyunjay...