concrete (exists only on homeplanets !) important for big starports and stargates and especially ship factories
	rock recommended for gib fusionpower stations, greenhouses and provision factories
	gras (this terrain doesn't appear often in the game, only through errors) recommended for greenhouses and farms
	wood recommended for greenhouses, residences and provision factories on woodplanets also recommended for luxury factories
	steppe recommended for farms  on steppenplanets also recommended for living modules, luxury factories, equipment factories, depots, storehouses and middle greenhouses
	dessert recommended for derricks, solarpower stations and small refineries
	ice recommended for depots, storehouses, living modules, spaceship controls, radar stations, liquid tanks on iceplanets also recommended for small fusionpower stations
	water recommended for waterpower stations on waterplanets also recommended for derricks
	swamp recommended for small greenhouses, recycling centers and MASH-fans on homeplanets also recommended for barracks