The useful question about any old route is what it was for, because the purpose determined the line - and routes made for different purposes look completely different on the…
The useful question on any coastal path is why the route exists at all, because walking was rarely the reason. Somebody needed to get along this coast, and the path…
A treeline is not one phenomenon. It is wherever a particular limiting factor becomes severe enough, and the factor differs entirely between a mountain, a bog, a coast and a…
The question worth asking at any waterfall is what makes the drop possible, because a river will otherwise smooth its own bed given enough time. Something is preventing that, and…
The first question at any boundary is what it is made of, because that was decided entirely by what was to hand. The second is what shape it is, which…
The single variable that explains most of what you see is how thick the lava was. Runny lava spreads out and builds gentle slopes; thick lava traps gas, moves barely…