Reddit mentions of Earth: An Introduction to Physical Geology (11th Edition)

The only thing I can think of is "befriend a geologist who enjoys hiking" (I'm keen if you live in Queensland! But unlikely!).

While not the answer you're looking for... why don't you learn some basic geology yourself? You could then make your own assumptions on why the landscape looks a certain way, or why you're finding certain rocks in an area.

I found a entry course online but I can't attest to how good it is. Or if you're looking for something a bit more this textbook can be really interesting to someone who has an interest in earth science and will cover all the basics! I know it's a scientific textbook but it's a great read if you are interested in learning about the basics of earth science.

Geology/geography is pretty interesting in its own right, and learning about it can help you make your maps more 'realistic'. Granted, that may or may not be what you want, but it's a start. Understanding how rivers form, how glaciers form landforms, and how things like mountain ranges, deserts, islands, and other massive landforms form can really help you make a convincing map that doesn't appear so alien that you have to come up with a whole new set of physics rules to justify it.

I recommend getting an older geology 101 textbook if you're like me and get distracted when you try and read things on the internet. Sure, you can get most of the information online for free, but you can get used, old editions of textbooks for cheap and then you have something you don't need internet acces or even power for. You can get this one for <$20 used, and it's pretty decent. I'm sure there's better/cheaper options out there, but this is what I used in my geology class and it's really interesting.