All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary ... and Northern Ireland, 3rd and 4th Level in Scotland, and ...

Secondary agricultural goods are treated products and preparations from primary agricultural goods. Together, these form the main definition of agricultural goods. Tertiary agricultural goods are ...

and the secondary colours close secondary coloursGreen, orange and purple. These colours can be made mixing the primary colours together.. The tertiary colours in the colour wheel sit between a ...