Curated OER
once and future MOON
Beyond the phases of the moon, this comprehensive lesson plan covers geologic history and geology. Amateur astronauts examine photos of the lunar landscape, experiment with the creation of craters, and delve into information about the...
US Geological Survey
Usgs: Geologic Maps
This site has a good description of what this particular type of map represents. It also explains the colors and letter symbols, faults, and strike and dips.