Mauna Loa is an active shield volcano located on the island of Hawaii. It is the largest volcano on Earth in terms of volume and area covered, and is one of five volcanoes that form the Island of Hawaii. The crossword solutions for the term Mauna Loa Output are ASH (3 letters) and LAVA (4 letters). ASH is a type of solid material that is created when a volcano erupts, while LAVA is molten rock that is expelled from a volcano during an eruption.