A collapsed building destroys adjacent tiles. To prevent a chain reaction that burns down your entire city, you must leave (a road or empty grass) between housing blocks. Large buildings (like the Cathedral) require a perimeter of roads to prevent "Slums" status.
You can place fields the farm in a donut shape, ignoring roads entirely, then road only from farm to warehouse.
: Keep chains efficient by placing related buildings together (e.g., 2 Cattle Farms to 1 Butcher Shop) to feed roughly 1,000 citizens. Early Claiming
Do you have a winning layout for the "Volcano Island" scenario? Share your blueprints in the comments below.