These involve the extraction of raw materials to be supplied to other industries.
Primary industries
Which of the following is a solvent of air?
Nitrogen
The sum of the interior angles of a triangle.
180 degree
To make 500g of a 10% (m/m) sugar solution, how many grams of sugar will be needed?
50g
A plan of a journey, including the route and the places that you visit.
Itinerary
The geometric transformation where preimage and an image can coincide perfectly with each other without flipping, turning or enlarging/reducing.
Translation
Which is the solvent of cooper alloy composed of 35% gold, 60% copper, and 5% silver?
Copper
These are where raw materials are assembled or manufactured to produce finished goods.
Secondary industries