Which scale is the same as 1 cm
= 30 km?

within these regions are all the major types of biomes in the world. a biome is a community of animals and plants spreading over an extensive area with a relatively uniform climate. some diverse biomes represented in north america include desert, grassland, tundra, and coral reefs.

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／