Keywords: Von Thünen circles city.svg Johann Heinrich von Thünen's model of agricultural distribution around a city in concentric circles The dot represents a city The white area around it 1 represents dairy and market gardening; 2 green the forest for fuel; 3 yellow field crops and grains; 4 red Ranching and livestock ;and the outer dark green region represents the wilderness where agriculture is not practised Vector image based on Von thunen circles city gif by on the Wikipedia article on von Thünen and Human Geography Culture Society and Space by H J de Blij and B Murphy 7th edition 2003 Erin Silversmith Other fields + U Bkwillwm and Erin Round diagrams Geographic diagrams |