The Chinese Yutu moon rover found evidence of at least nine distinct rock layers beneath its wheels – on one small stretch of the lunar surface – see www.space.com/28810-moon-history-chinese-moon-rover.html
This suggests the Moon has been geologically active according to Long Xiao, and volcanoes may be part of that activity. Yutu was equipped with 3 cameras designed to cary out different tasks such as penetrating radar, near infrared spectrometry and X-ray spectrometry. The initial round of research was published in the journal Science (march 12th).