that's been brought up so many times, but that would be really tricky considering the engine as it stands today, and also make for incredible difficulty in building. ie. "what defines a structure that can withstand an earthquake?", "can blocks within that structure also stay intact?", etc. plus the obvious "what defines a manmade structure"? because you can't have a constantly dynamic environment. Minecraft is already resource-intense, and that would destroy hard drives. No-one would want to host a server with that amount of extra stuff...+Darwin Bell
What, the area that defines a particular biome? because the whole world is already in the save file... and that would be so broken. Certain weathers are associated with certain types of area, and each chunk cannot be redefined to be a different shape, so no matter how you read your question, it doesn't make any sense.+taylan unal
Given that a river, by definition, flows, I would assume that they flow downhill... otherwise they would have to be either all source blocks on a fixed Y coordinate, or they would have to break physics....