Answer:
1. Mixtures are just as important as elements, compounds or alloys. In fact, the air that you are breathing right now is a mixture of oxygen, nitrogen and some lesser gases! Mixtures are used in many processes, including steel manufacturing, the chemical industry and many others.
2. Petroleum, hydrocarbons, and fuel additives (Gasoline)
Sand, water and gravel (Cement)
a mixture of cream, buttermilk, and skim milk (Milk)
3. Solid
4. suspensions and colloids.
