Lunar Volcanism Seen and Unseen: Maria are a larger portion of the lunar surface than previously known.

The article discusses the presence of lunar volcanism on the Moon's surface. It explains that the dark patches on the Moon, known as maria, are made of basaltic lava and have volcanic origins. The article also mentions the existence of intrusive rocks, which are concealed beneath the lunar crust but can be detected by their effects on the surface. The authors present global estimates of the amount of igneous rock on the Moon, including both extrusive and intrusive rocks. They calculate that the maria make up about 17% of the lunar surface, with other types of igneous material also present. The article concludes by highlighting the significance of these findings and the complexity of the Moon's volcanic history. [Extracted from the article]