In this April 25, 2019 photo, Hawaii's Mauna Loa volcano, background, towers over the summit crater of Kilauea volcano in Hawaii Volcanoes National Park on the Big Island. Federal officials raised the alert level for Mauna Loa, the world's largest active volcano, Tuesday, July 2, 2019. The U.S. Geological Survey changed the level from normal to advisory after observing a slight increase in earthquakes and ground swelling over the past several months. Officials say the increased alert level does not mean an eruption is imminent. (AP Photo/Caleb Jones)