The name evokes the moon, but the cause is from Earth's interior. Magma travels along deep fissures to the surface, forming lava flows, volcanic ash cones, and related landforms, not impact craters formed by meteorite impacts.
The National Park Service notes that the main lava fields experienced multiple eruptions spanning approximately 15,000 to 2,000 years ago. The hardened surface exhibits various textures, which also record the ways in which the lava flowed and cooled.









