AskScience: Got Questions? Get Answers.

I often find myself curious about the types of rock and erosion thereof that I come across in life. I know it's kind of a niche thing but I don't really know where to look to find out why specific land features are the way they are on a local basis.. Like how did these rocks get all wavy and why do they differ from all the other rocks in the area? Why do the rocks across from them on the road seem to be a totally different type of rock, and why do they seem to manifest an entirely different type of erosion?

Things like that. I've always wished there was a sort of Google maps type thing made specifically for unique geologic features.. Is there at least a database that has these things listed where I could get these kinds of questions answered?