Mauna Loa is the largest volcano on Earth.  This massive shield volcano is at the Hawaii Hotspot, along with its better-known neighbor, Kilauea Volcano.  Mauna Loa is not currently erupting, but did have eruptions in 1859, 1881, the 1940s, 1975, and 1984.  Shown below is a sample from one of Mauna Loa's 1949 lava flows.


Scoriaceous basalt (8.0 cm across) from a 1949 lava flow eruption of Mauna Loa Volcano, Hawaii Hotspot, central Pacific Ocean.



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