There's lots of free geographical data about what's going on at the surface of our planet. It's a different story for what going on underneath though. OneGeology aims to be the solution to that problem.
OneGeology is an international initiative of the geological surveys of the world and a flagship project of the 'International Year of Planet Earth'. Its aim is to create dynamic geological map data of the world available via the web. This will create a focus for accessing geological information for everyone.
I've never been one for the geology, but if the data (and interactive maps) were easily accessible, there certainly would be a peak in interest.
[via msnbc | Thanks, Samantha]