Gas and steam erupt from the Halemaumau crater of the Kilauea volcano on Dec. 21 in Hawaii Volcanoes National Park.

KILAUEA, HI – DECEMBER 21: Gas and steam erupt from the Halemaumau Crater of the Kilauea Volcano on December 21, 2020 in Hawaii Volcanoes National Park, Hawaii. The Kilauea Volcano has been inactive for the past two years, reactivating the previous night on December 20th. (Photo by Andrew Richard Hara/Getty Images)