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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