Mare Volcanism

Mare Surface		Imbrium Flow Map
Mare Humorum		Mare Marginis
Mare Moscoviense		Types of Mare Basalt
Major Lunar Mare

Due to their size, the lunar maria are the most obvious volcanic features on the Moon. These vast basalt plains cover over 15% of the lunar surface, mostly on the Moon's nearside. They are typically circular in outline because they tend to fill the bottoms of very large, very old impact basins. Smaller mare patches also occur in the floors of some impact craters. They also are very old, and have been battered by the impacts of many small meteorites for over 3 billion years.


Volcanoes on the Moon       VolcanoWorld