1- Raw materials

classify:

Oil, iron, bauxite, silk, cotton, milk, gold, coal, tuna, wood, granite,diamonds, skin, salt, ivory, cooper, tomatoes, sulphur,mercury, wool,linen, resin, rubber, cork

Animal raw materials	Vegetal raw materials	mineral	raw	materials
silk	oil	metallic	Non-metalic	power
cotton	cork	iron	salt	rubber
skin	resin	diamonds	bauxite	sulphur
milk	tomatoes	granite		cooper
tuna	cotton	coal		line
ivory	wood	gold
wool		mercury