natural resources, what do you obtein from the primary sector?, agriculture, a type of primary sector, four, the number in letters of the percentage of primary sector in Spain, human feeding, why agriculture is the most important in this sector?, physical, a type of agriculture activities, human, the other type of agriculture activities, warm, what needs crops in climate?, valleys, where it is usually located agriculture?, terraces, where is cultivated mountain slopes?, nutrients, what ground must be rich in?, production, what affect size and rate growth for?, sharecropping, what is a contract in land ownership?, land renting, when the worker pays a periodical rent to exploit the land, agrarian landscape , mix between physic and human elements, openfields, plots of land withouth fences.

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