Have you ever wondered what kind of rocks make up those bright and dark splotches on the moon? Well, the USGS has just released a new authoritative map to help explain the 4.5-billion-year-old history of our nearest neighbor in space.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/usgsreleases.jpg)
Source:
https://phys.org/news/2020-04-usgs-first-ever-comprehensive-geologic-moon.html